What is a star, fundamentally, in terms of its basic nature

A massive ball of gas undergoing nuclear fusion

Stars, Galaxies & the Universe MCQs 2026

63 questions with detailed answers · 0 from past papers · 7 quiz batches available

📚 Everyday Science Mcqs ✓ Free · No Login Needed

Read each question, think about the answer, then click Show Answer to reveal the correct option and explanation. Load 10 at a time so it stays manageable — perfect for one-topic study sessions on the bus or during a break.

Page 1 of 1 Questions 1–10 of 63

Q1 medium

What is the term for a massive, extremely dense object believed to exist at the center of most large galaxies, including our own Milky Way
1. A Supermassive black hole
2. B Neutron star (much smaller than these galactic-center objects)
3. C White dwarf (much smaller than these galactic-center objects)
4. D Nebula (a cloud of gas/dust, unrelated to this concept)
💡 Explanation:
A supermassive black hole is believed to exist at the center of most large galaxies, including our own Milky Way.
Q2 easy

What is a star, fundamentally, in terms of its basic nature
1. A A massive ball of gas undergoing nuclear fusion
2. B A solid rocky body
3. C A collection of ice and dust
4. D An artificial satellite
💡 Explanation:
A star is fundamentally a massive ball of gas, primarily hydrogen and helium, undergoing nuclear fusion in its core.
Q3 easy

What is the name of the galaxy that contains our solar system
1. A Andromeda Galaxy
2. B Milky Way Galaxy
3. C Triangulum Galaxy
4. D Whirlpool Galaxy
💡 Explanation:
Our solar system is located within the Milky Way Galaxy.
Q4 medium

What type of galaxy is the Milky Way, based on its overall structure
1. A Elliptical galaxy
2. B Spiral galaxy
3. C Irregular galaxy
4. D Lenticular galaxy
💡 Explanation:
The Milky Way is classified as a spiral galaxy, characterized by its rotating disk with spiral arms.
Q5 medium

What is the closest large galaxy to the Milky Way, expected to eventually collide with it
1. A Triangulum Galaxy
2. B Andromeda Galaxy
3. C Whirlpool Galaxy
4. D Sombrero Galaxy
💡 Explanation:
The Andromeda Galaxy is the closest large galaxy to the Milky Way and is predicted to eventually collide with it in the distant future.
Q6 medium

Approximately how many stars are estimated to be in the Milky Way Galaxy
1. A A few thousand
2. B A few million
3. C 100-400 billion
4. D Several trillion
💡 Explanation:
The Milky Way is estimated to contain approximately 100-400 billion stars.
Q7 easy

What is the general term for a massive cloud of gas and dust in space, often a site of star formation
1. A Nebula
2. B Galaxy (a much larger structure)
3. C Constellation (a pattern of stars, not a physical object)
4. D Asteroid (a small rocky body, unrelated)
💡 Explanation:
A nebula is a massive cloud of gas and dust in space, often serving as a stellar nursery where new stars form.
Q8 medium

What is the term for the death explosion of a massive star, one of the most energetic events in the universe
1. A Supernova
2. B Nova (a smaller-scale stellar explosion, different mechanism)
3. C Nebula (a cloud of gas/dust, not an explosive event itself)
4. D Black hole (a resulting object, not the explosive event itself)
💡 Explanation:
A supernova is the powerful explosive death of a massive star, among the most energetic events observed in the universe.
Q9 medium

What extremely dense object can form from the collapsed core of a massive star after a supernova, with gravity so strong not even light can escape
1. A White dwarf (results from smaller stars, different end state)
2. B Neutron star (an intermediate possibility, depending on mass)
3. C Black hole
4. D Red giant (an earlier stage of stellar evolution, not an end state)
💡 Explanation:
A black hole can form from the collapsed core of a sufficiently massive star, with gravity so intense that not even light can escape.
Q10 medium

What extremely dense stellar remnant, composed primarily of tightly packed neutrons, can form from a supernova of a somewhat less massive star than needed for a black hole
1. A White dwarf (results from smaller stars, different composition)
2. B Neutron star
3. C Black hole (results from more massive stellar cores)
4. D Red giant (an earlier evolutionary stage, not a remnant)
💡 Explanation:
A neutron star is an extremely dense stellar remnant composed primarily of neutrons, forming from certain supernova explosions.
Q11 medium

What is the term for the dense, small remnant left behind after a lower-mass star like our Sun exhausts its nuclear fuel
1. A White dwarf
2. B Neutron star (results from more massive stars)
3. C Black hole (results from even more massive stars)
4. D Red giant (an earlier stage, not a final remnant)
💡 Explanation:
A white dwarf is the dense remnant left after a lower-mass star, like our Sun, exhausts its nuclear fuel and sheds its outer layers.
Q12 medium

What stage of stellar evolution involves a star expanding dramatically as it exhausts hydrogen fuel in its core
1. A Main sequence (the stable, hydrogen-burning stage, not this expansion phase)
2. B Red giant phase
3. C White dwarf phase (a later, contracted remnant stage)
4. D Supernova phase (a later, explosive stage for massive stars)
💡 Explanation:
The red giant phase occurs as a star exhausts core hydrogen fuel and dramatically expands, cooling and reddening in the process.
Q13 medium

What is the stable, longest phase of a star's life, during which it fuses hydrogen into helium in its core
1. A Main sequence
2. B Red giant phase (a later expansion stage)
3. C White dwarf phase (a final remnant stage)
4. D Protostar phase (an earlier formation stage)
💡 Explanation:
The main sequence is the stable, longest phase of a star's life, characterized by hydrogen fusion into helium in its core.
Q14 medium

What term describes the earliest formative stage of a star, before nuclear fusion has begun
1. A Protostar
2. B Main sequence star (a later, stable fusion stage)
3. C Red giant (a later expansion stage)
4. D White dwarf (a final remnant stage)
💡 Explanation:
A protostar represents the earliest formative stage of a star, existing before stable nuclear fusion has begun in its core.
Q15 easy

What theory describes the origin and expansion of the universe from an extremely hot, dense initial state
1. A Big Bang Theory
2. B Steady State Theory (an alternative, now largely discredited theory)
3. C String Theory (a different theoretical physics framework)
4. D Multiverse Theory (a different, more speculative concept)
💡 Explanation:
The Big Bang Theory describes the universe's origin and ongoing expansion from an extremely hot, dense initial state.
Q16 medium

Approximately how old is the universe estimated to be, according to current scientific consensus
1. A About 1 million years
2. B About 100 million years
3. C About 4.5 billion years (this is Earth's age, not the universe's)
4. D About 13.8 billion years
💡 Explanation:
Current scientific consensus estimates the universe to be approximately 13.8 billion years old.
Q17 medium

What key piece of observational evidence strongly supports the Big Bang Theory, discovered in 1965
1. A Cosmic microwave background radiation
2. B Direct photographs of the initial explosion
3. C Written historical records
4. D Radio signals from other civilizations
💡 Explanation:
The discovery of cosmic microwave background radiation in 1965 provided strong observational evidence supporting the Big Bang Theory.
Q18 hard

Who are credited with the accidental discovery of cosmic microwave background radiation
1. A Arno Penzias and Robert Wilson
2. B Edwin Hubble
3. C Albert Einstein
4. D Stephen Hawking
💡 Explanation:
Arno Penzias and Robert Wilson accidentally discovered cosmic microwave background radiation in 1965, earning them a Nobel Prize.
Q19 medium

What astronomer is credited with discovering that the universe is expanding, based on observations of galaxy redshifts
1. A Edwin Hubble
2. B Albert Einstein
3. C Stephen Hawking
4. D Carl Sagan
💡 Explanation:
Edwin Hubble is credited with discovering the universe's expansion, based on his observations of redshifts in distant galaxies.
Q20 hard

What is the relationship, discovered by Hubble, between a galaxy's distance and its recession velocity
1. A More distant galaxies recede faster (Hubble's Law)
2. B More distant galaxies recede slower
3. C Distance has no relationship to recession velocity
4. D Only nearby galaxies show any recession at all
💡 Explanation:
Hubble's Law describes the relationship where more distant galaxies are observed to recede from us at faster velocities.
Q21 medium

What mysterious force is theorized to be causing the accelerating expansion of the universe
1. A Dark energy
2. B Dark matter (a different theoretical concept - relates to mass, not expansion acceleration specifically)
3. C Antimatter (a different concept entirely)
4. D Gravitational waves (a different, observed phenomenon, not this specific driving force)
💡 Explanation:
Dark energy is the mysterious theoretical force believed to be driving the observed accelerating expansion of the universe.
Q22 medium

What mysterious, non-luminous form of matter is theorized to explain gravitational effects observed in galaxies that cannot be accounted for by visible matter alone
1. A Dark energy (relates to universe expansion, different concept)
2. B Dark matter
3. C Antimatter (a different concept entirely)
4. D Neutrinos (a real, detected particle, though distinct from the broader dark matter theory)
💡 Explanation:
Dark matter is a theoretical form of non-luminous matter proposed to explain otherwise unaccounted-for gravitational effects observed in galaxies.
Q23 hard

Approximately what percentage of the universe's total mass-energy content is estimated to be dark matter and dark energy combined
1. A About 5%
2. B About 25%
3. C About 50%
4. D About 95%
💡 Explanation:
Current estimates suggest dark matter and dark energy together constitute approximately 95% of the universe's total mass-energy content, with ordinary matter making up only about 5%.
Q24 hard

What is the name of the supermassive black hole believed to be at the center of our Milky Way Galaxy
1. A Sagittarius A*
2. B Cygnus X-1 (a different, well-known black hole candidate, not the galactic center)
3. C M87* (the supermassive black hole of a different galaxy, first directly imaged)
4. D TON 618 (a different, extremely massive black hole in another galaxy)
💡 Explanation:
Sagittarius A* is the name given to the supermassive black hole believed to reside at the center of our Milky Way Galaxy.
Q25 medium

What historic scientific achievement occurred in 2019, providing the first-ever direct image of a black hole (specifically, of galaxy M87)
1. A First direct image of a black hole's event horizon shadow
2. B First landing on a black hole (physically impossible)
3. C First detection of gravitational waves (a related but separate 2015 achievement)
4. D First discovery of dark matter (still theoretical, not directly imaged)
💡 Explanation:
In 2019, scientists achieved the historic first direct image of a black hole's event horizon shadow, specifically of the black hole in galaxy M87.
Q26 medium

What is the term for ripples in spacetime caused by certain massive cosmic events, such as merging black holes
1. A Cosmic microwave background (a different phenomenon - relates to early universe radiation)
2. B Gravitational waves
3. C Dark energy (a different theoretical concept)
4. D Solar wind (an unrelated, much smaller-scale solar phenomenon)
💡 Explanation:
Gravitational waves are ripples in spacetime caused by massive cosmic events, such as merging black holes, first directly detected in 2015.
Q27 hard

What facility achieved the first direct detection of gravitational waves in 2015
1. A LIGO (Laser Interferometer Gravitational-Wave Observatory)
2. B Hubble Space Telescope (a different type of astronomical instrument)
3. C Large Hadron Collider (a particle physics facility, different purpose)
4. D Event Horizon Telescope (achieved the black hole imaging, different specific achievement)
💡 Explanation:
LIGO achieved the historic first direct detection of gravitational waves in 2015, confirming a major prediction of Einstein's general relativity.
Q28 hard

What is the name of the supercluster of galaxies that contains our own Milky Way Galaxy
1. A Virgo Supercluster (part of the broader Laniakea Supercluster)
2. B Local Group (a smaller-scale galaxy grouping, within the supercluster)
3. C Both Local Group and Laniakea Supercluster relate to describing our galaxy's broader cosmic neighborhood at different scales
4. D Andromeda Supercluster (not the correct name for our supercluster)
💡 Explanation:
Our Milky Way belongs to the Local Group (smaller scale) which is itself part of the larger Laniakea Supercluster.
Q29 medium

What constellation is commonly known as "The Great Bear," containing the well-known asterism the Big Dipper
1. A Orion
2. B Ursa Major
3. C Cassiopeia
4. D Scorpius
💡 Explanation:
Ursa Major, "The Great Bear," contains the well-known Big Dipper asterism within its boundaries.
Q30 hard

What is the term for a recognizable star pattern that is not one of the officially designated 88 constellations, such as the Big Dipper
1. A Constellation (the official, broader category)
2. B Asterism
3. C Nebula (unrelated concept)
4. D Galaxy (unrelated concept, much larger)
💡 Explanation:
An asterism is a recognizable star pattern, like the Big Dipper, that is not one of the officially designated 88 constellations itself.
Q31 medium

What prominent winter constellation, visible in both hemispheres, features a distinctive three-star "belt"
1. A Orion
2. B Ursa Major
3. C Cassiopeia
4. D Leo
💡 Explanation:
Orion is a prominent constellation featuring a distinctive three-star belt, visible from both hemispheres during winter months.
Q32 medium

What zodiac constellation, associated with scorpions, is prominently visible in summer skies
1. A Orion (a winter constellation, different season)
2. B Scorpius
3. C Cassiopeia (not a zodiac constellation)
4. D Ursa Major (not a zodiac constellation)
💡 Explanation:
Scorpius, associated with scorpions in mythology, is prominently visible in summer night skies.
Q33 medium

What is the term for the twelve constellations traditionally associated with astrology, along the apparent path of the Sun
1. A Zodiac constellations
2. B Circumpolar constellations (a different category - always visible from certain latitudes)
3. C Equatorial constellations (not standard specific terminology)
4. D Polar constellations (not standard specific terminology)
💡 Explanation:
The zodiac constellations are the twelve traditional constellations along the ecliptic, the apparent path of the Sun through the sky.
Q34 hard

What term describes constellations that remain visible year-round from a given latitude, never setting below the horizon
1. A Zodiac constellations (a different specific category)
2. B Circumpolar constellations
3. C Equatorial constellations (not standard specific terminology in this context)
4. D Seasonal constellations (opposite concept - visible only certain times of year)
💡 Explanation:
Circumpolar constellations remain visible year-round from a given latitude, appearing to circle the celestial pole without setting.
Q35 hard

What is the term for the smaller galaxy grouping, including the Milky Way, Andromeda, and roughly 80 other smaller galaxies
1. A Local Group
2. B Virgo Cluster (a different, nearby but distinct galaxy cluster)
3. C Laniakea Supercluster (the larger-scale structure containing the Local Group)
4. D Coma Cluster (a different, more distant galaxy cluster)
💡 Explanation:
The Local Group is the galaxy grouping containing the Milky Way, Andromeda, and roughly 80 other smaller galaxies.
Q36 medium

What is the closest star to Earth, aside from our own Sun
1. A Alpha Centauri (the broader star system)
2. B Proxima Centauri
3. C Sirius (a different, bright but more distant star)
4. D Betelgeuse (a different, much more distant star)
💡 Explanation:
Proxima Centauri, part of the Alpha Centauri star system, is the closest individual star to Earth (aside from the Sun).
Q37 hard

What classification system, based on temperature and color, categorizes stars into types such as O, B, A, F, G, K, and M
1. A Stellar classification system (Harvard spectral classification)
2. B Hertzsprung-Russell diagram (a related, visual plotting tool, distinct from this letter classification)
3. C Magnitude scale (relates to brightness, different classification method)
4. D Constellation system (relates to star patterns, unrelated to this classification)
💡 Explanation:
The stellar classification (Harvard spectral) system categorizes stars by temperature and color into types O, B, A, F, G, K, and M.
Q38 medium

What type of star classification is our Sun, based on the standard stellar classification system
1. A O-type (much hotter stars)
2. B G-type
3. C M-type (much cooler stars)
4. D B-type (much hotter stars)
💡 Explanation:
Our Sun is classified as a G-type star, a relatively common, moderate-temperature classification.
Q39 hard

What visual tool plots stars according to their luminosity (brightness) and temperature, revealing patterns in stellar evolution
1. A Stellar classification system (a related but distinct letter-based system)
2. B Hertzsprung-Russell diagram
3. C Magnitude scale (relates to brightness alone, different tool)
4. D Constellation map (relates to star patterns, unrelated purpose)
💡 Explanation:
The Hertzsprung-Russell diagram plots stars by luminosity and temperature, revealing important patterns in stellar evolution.
Q40 hard

What is the term for the scale used to measure the brightness of celestial objects as seen from Earth
1. A Stellar classification (relates to temperature/color, different scale)
2. B Magnitude scale
3. C Hertzsprung-Russell diagram (a plotting tool, distinct from this specific brightness scale)
4. D Distance scale (not a standard specific astronomical measurement system)
💡 Explanation:
The magnitude scale is used to measure and compare the brightness of celestial objects as observed from Earth.
Q41 hard

On the astronomical magnitude scale, does a lower number generally indicate a brighter or dimmer object
1. A Brighter object
2. B Dimmer object
3. C Magnitude has no relationship to brightness
4. D Only applies to planets, not stars
💡 Explanation:
On the astronomical magnitude scale, lower (or more negative) numbers indicate brighter objects, which can initially seem counterintuitive.
Q42 hard

What is the currently accepted ultimate fate theory for the universe, given the observed accelerating expansion
1. A Heat death (or "Big Freeze") - continued expansion leading to maximum entropy
2. B Big Crunch - eventual contraction back to a singularity (less favored given current expansion data)
3. C Big Bounce - cyclical expansion and contraction (a more speculative alternative theory)
4. D The universe will remain in its exact current state forever, unchanged
💡 Explanation:
Given the observed accelerating expansion, the "heat death" or "Big Freeze" scenario, involving continued expansion toward maximum entropy, is currently the most favored theoretical outcome.
Q43 medium

What galaxy type is characterized by a smooth, featureless, oval or spherical shape, lacking distinct spiral arms
1. A Spiral galaxy (different structure)
2. B Elliptical galaxy
3. C Irregular galaxy (a different, less structured category)
4. D Lenticular galaxy (an intermediate type, though still distinct)
💡 Explanation:
Elliptical galaxies are characterized by their smooth, featureless, oval or spherical overall shape, lacking the spiral arm structure.
Q44 medium

What galaxy type lacks a regular, defined structure, often resulting from gravitational interactions or collisions with other galaxies
1. A Spiral galaxy (has defined arm structure)
2. B Elliptical galaxy (has defined oval/spherical structure)
3. C Irregular galaxy
4. D Lenticular galaxy (has a defined disk structure)
💡 Explanation:
Irregular galaxies lack a regular, defined structure, often resulting from gravitational interactions or collisions with other galaxies.
Q45 medium

What is the term for a large-scale structure in the universe, consisting of galaxies bound together by gravity, larger than an individual galaxy
1. A Galaxy cluster
2. B Solar system (a much smaller structure, a single star system)
3. C Nebula (a cloud of gas/dust, a much smaller and different structure)
4. D Constellation (a star pattern as viewed from Earth, an entirely different concept)
💡 Explanation:
A galaxy cluster is a large-scale gravitationally bound structure consisting of numerous galaxies.
Q46 hard

What is the term for even larger structures than galaxy clusters, consisting of multiple galaxy clusters and groups bound together
1. A Superclusters
2. B Solar systems (much smaller structures)
3. C Nebulae (much smaller and different structures)
4. D Constellations (an entirely different, Earth-perspective concept)
💡 Explanation:
Superclusters represent even larger cosmic structures than galaxy clusters, consisting of multiple galaxy clusters and groups.
Q47 easy

What term describes a group of stars that appear to form a recognizable pattern when viewed from Earth
1. A Galaxy (a much larger structure)
2. B Constellation
3. C Nebula (a cloud of gas/dust, different concept)
4. D Solar system (a specific star with orbiting bodies, different concept)
💡 Explanation:
A constellation is a recognizable pattern of stars as viewed from Earth, though the stars themselves are often not physically related or close together.
Q48 medium

How many officially recognized constellations are there, according to the International Astronomical Union
1. A 12
2. B 48
3. C 88
4. D 120
💡 Explanation:
The International Astronomical Union officially recognizes 88 constellations covering the entire celestial sphere.
Q49 hard

What famous equation, developed to estimate the number of potentially communicative civilizations in our galaxy, is named after its creator
1. A Drake Equation
2. B Einstein's Equation (relates to mass-energy equivalence, different purpose)
3. C Hubble's Law (relates to universe expansion, different purpose)
4. D Kepler's Laws (relate to orbital motion, different purpose)
💡 Explanation:
The Drake Equation, developed by astronomer Frank Drake, estimates the potential number of communicative civilizations within our galaxy.
Q50 medium

What scientific research initiative specifically searches for signals or evidence of extraterrestrial intelligent life
1. A SETI (Search for Extraterrestrial Intelligence)
2. B NASA (a broader space agency, SETI is a more specific, related initiative)
3. C ESA (a broader space agency, different from this specific search initiative)
4. D ISRO (a broader space agency, different from this specific search initiative)
💡 Explanation:
SETI (Search for Extraterrestrial Intelligence) is a scientific initiative specifically focused on searching for signals or evidence of intelligent extraterrestrial life.
Q51 hard

What is the term for the apparent absence of observable extraterrestrial civilizations despite high probability estimates for their existence, a notable unresolved question
1. A Fermi Paradox
2. B Drake Equation (relates to estimating civilization numbers, a different specific concept)
3. C Prime Directive (a fictional concept from Star Trek, not a real scientific paradox)
4. D Great Filter (a related theoretical concept attempting to explain the paradox, though distinct itself)
💡 Explanation:
The Fermi Paradox refers to the apparent contradiction between high estimated probabilities for extraterrestrial civilizations and the lack of observed evidence for them.
Q52 medium

What is the general term for the scientific study of the possibility of life elsewhere in the universe
1. A Cosmology (a different, broader field - focused on universe origin/evolution)
2. B Astrobiology
3. C Astrophysics (a different, broader field - focused on physical processes of celestial objects)
4. D Exogeology (a more narrow, less common term, focused specifically on planetary geology)
💡 Explanation:
Astrobiology is the scientific field specifically studying the possibility of life elsewhere in the universe.
Q53 medium

What is the general term for the scientific study of the origin, evolution, and eventual fate of the universe as a whole
1. A Astronomy (a broader field, encompassing celestial object study generally)
2. B Cosmology
3. C Astrophysics (a related, overlapping field, though cosmology is more specifically focused)
4. D Astrobiology (a different, more specific field - focused on life in the universe)
💡 Explanation:
Cosmology is the specific scientific field studying the origin, evolution, and ultimate fate of the universe as a whole.
Q54 medium

Which renowned scientist and science communicator popularized the "Pale Blue Dot" image and its philosophical significance
1. A Carl Sagan
2. B Stephen Hawking (also renowned, but not primarily associated with popularizing this specific image)
3. C Neil deGrasse Tyson (also renowned, but came after the image's initial popularization)
4. D Albert Einstein (unrelated to this specific image or its era)
💡 Explanation:
Carl Sagan famously popularized the "Pale Blue Dot" image and its profound philosophical significance regarding humanity's place in the cosmos.
Q55 medium

What historic 1990 photograph, taken by Voyager 1 from billions of miles away, shows Earth as a tiny, barely visible dot in space
1. A Pale Blue Dot
2. B Earthrise (a different famous image, taken during Apollo 8)
3. C Pillars of Creation (a different famous Hubble image)
4. D Hubble Deep Field (a different famous Hubble image)
💡 Explanation:
The famous "Pale Blue Dot" photograph, taken by Voyager 1 in 1990, shows Earth as a tiny, barely visible point in the vast expanse of space.
Q56 medium

What famous Hubble Space Telescope image depicts towering columns of gas and dust within the Eagle Nebula, a site of active star formation
1. A Hubble Deep Field (a different famous image, of distant galaxies)
2. B Pillars of Creation
3. C Pale Blue Dot (a different famous image, taken by Voyager 1)
4. D Earthrise (a different famous image, taken during Apollo 8)
💡 Explanation:
The "Pillars of Creation" is a famous Hubble image depicting towering gas and dust columns within the Eagle Nebula, an active star-forming region.
Q57 medium

What famous deep-field image, captured by the Hubble Space Telescope, revealed thousands of previously unseen distant galaxies in a tiny patch of sky
1. A Hubble Deep Field (and related deep field images)
2. B Pale Blue Dot (a different famous image, taken by Voyager 1)
3. C Earthrise (a different famous image, taken during Apollo 8)
4. D Pillars of Creation (a different famous Hubble image, of a nebula rather than distant galaxies)
💡 Explanation:
The Hubble Deep Field images revealed thousands of previously unseen distant galaxies within remarkably tiny patches of sky.
Q58 medium

In what year was the Hubble Space Telescope launched into orbit
1. A 1970
2. B 1980
3. C 1990
4. D 2000
💡 Explanation:
The Hubble Space Telescope was launched into orbit in 1990.
Q59 easy

What is the name of humanity's space telescope specifically named after a pioneering astronomer who discovered the universe's expansion
1. A Kepler Space Telescope (named after a different astronomer)
2. B Hubble Space Telescope
3. C Spitzer Space Telescope (named after a different astronomer)
4. D Chandra X-ray Observatory (named after a different astronomer)
💡 Explanation:
The Hubble Space Telescope is named after Edwin Hubble, the astronomer who discovered the universe's expansion.
Q60 medium

What term describes a small, cool, relatively dim star, among the most common type in the universe
1. A Red giant (a much larger, more luminous type)
2. B Red dwarf
3. C Blue giant (a much larger, hotter type)
4. D White dwarf (a stellar remnant, different classification)
💡 Explanation:
Red dwarfs are small, cool, relatively dim stars, representing the most common star type throughout the universe.
Q61 medium

What term describes a star significantly larger and more luminous than the Sun, having exhausted its core hydrogen and expanded dramatically
1. A Red dwarf (a smaller, dimmer type of star)
2. B Red giant/supergiant
3. C White dwarf (a much smaller, denser remnant)
4. D Neutron star (an even denser stellar remnant)
💡 Explanation:
Red giants and supergiants are significantly larger, more luminous stars that have exhausted core hydrogen and expanded dramatically.
Q62 medium

What red supergiant star, located in the constellation Orion, is expected to eventually explode as a supernova
1. A Sirius (a different, much smaller star)
2. B Betelgeuse
3. C Polaris (a different type of star, not a red supergiant)
4. D Proxima Centauri (a much smaller, closer star)
💡 Explanation:
Betelgeuse, a red supergiant in Orion, is expected to eventually undergo a supernova explosion, though the exact timing remains uncertain.
Q63 medium

What is the name of the brightest star visible from Earth's night sky, located in the constellation Canis Major
1. A Sirius
2. B Proxima Centauri
3. C Betelgeuse
4. D Polaris
💡 Explanation:
Sirius, located in Canis Major, is the brightest star visible from Earth's night sky.

Jump to page:

Stars, Galaxies & the Universe MCQs 2026

More Everyday Science Mcqs Topics