Can You Pass This Black Hole Quiz? Test Your Knowledge
Black holes are some of the strangest objects in the universe. They are incredibly massive, extremely compact, and surrounded by physics that can feel completely different from anything we experience on Earth.
But how much do you actually know about them?
This black hole quiz covers everything from basic concepts like event horizons and gravity to more challenging ideas such as Hawking radiation, gravitational waves, accretion disks and supermassive black holes.
There are 50 questions in total. Some are straightforward, while others are designed to catch you out if you only know the basics.
Before You Take the Black Hole Quiz
Want to warm up first? Try this space quiz video, which includes questions about black holes, singularities, the event horizon and other astronomy topics.
Finished the video? Now it is your turn. Take the 50-question black hole quiz below and see how much you really know.
How to Play the Black Hole Quiz
- There are 50 multiple-choice questions.
- Choose one answer for each question.
- Try to answer without searching for the answer first.
- Keep track of your score as you go.
- Check the answer after each question or reveal all the answers at the end.
Ready? Let’s head beyond the event horizon.
Black Hole Quiz: 50 Questions
1. What is a black hole?
A. An empty region of space
B. A region where gravity is so strong that nothing, including light, can escape
C. A star that has stopped producing light
D. A hole connecting two galaxies
Answer: B
2. What is the event horizon?
A. The center of a galaxy
B. The hottest part of a black hole
C. The boundary beyond which escape from a black hole is impossible
D. The outer edge of an entire galaxy
Answer: C
3. Why can light not escape from inside a black hole's event horizon?
A. Light becomes too cold
B. Gravity prevents anything from escaping outward
C. Light loses its color
D. The black hole absorbs all colors separately
Answer: B
4. Which force is mainly responsible for the formation of a black hole?
A. Gravity
B. Magnetism
C. Electricity
D. Friction
Answer: A
5. What can happen to a very massive star at the end of its life?
A. It can collapse and potentially form a black hole
B. It always becomes a planet
C. It turns directly into a galaxy
D. It disappears without any physical change
Answer: A
6. What is the name commonly given to the predicted central point of a classical black hole?
A. Event point
B. Singularity
C. Photon ring
D. Corona
Answer: B
7. Which galaxy contains the supermassive black hole Sagittarius A*?
A. Andromeda Galaxy
B. Whirlpool Galaxy
C. Milky Way
D. Triangulum Galaxy
Answer: C
8. Sagittarius A* is located approximately where?
A. Near the center of the Milky Way
B. At the edge of the Solar System
C. Inside Earth's atmosphere
D. Between the Earth and Moon
Answer: A
9. What type of black hole is typically found at the centers of large galaxies?
A. Microscopic black hole
B. Supermassive black hole
C. Planetary black hole
D. Solar black hole
Answer: B
10. What is an accretion disk?
A. A ring of hot material orbiting and falling toward a compact object
B. A solid surface around every black hole
C. A cloud surrounding an entire galaxy
D. A second event horizon
Answer: A
11. Why can an accretion disk around a black hole shine brightly?
A. The black hole itself produces ordinary sunlight
B. Material in the disk becomes extremely hot as it moves and falls inward
C. Stars are created inside the disk every second
D. The event horizon reflects light
Answer: B
12. What is gravitational lensing?
A. The bending of light by gravity
B. The creation of artificial telescopes
C. The reflection of radio waves from planets
D. The blocking of all light by dust
Answer: A
13. What happens to space-time near a black hole?
A. It is strongly distorted by the black hole's gravity
B. It completely disappears
C. It becomes filled with ordinary air
D. It stops existing everywhere in the galaxy
Answer: A
14. What does the term "spaghettification" describe?
A. A method of detecting distant galaxies
B. The stretching of an object by extreme tidal forces
C. The formation of an accretion disk
D. The explosion of a star
Answer: B
15. What causes spaghettification?
A. Unequal gravitational forces across an object
B. Solar wind
C. Magnetic storms on Earth
D. Cosmic background radiation
Answer: A
16. Which theory predicts that massive objects can curve space-time?
A. General relativity
B. Plate tectonics
C. Evolutionary theory
D. Atomic theory
Answer: A
17. Who developed general relativity?
A. Isaac Newton
B. Albert Einstein
C. Galileo Galilei
D. Niels Bohr
Answer: B
18. What is the Schwarzschild radius?
A. The distance at which an object's escape velocity equals the speed of light in the non-rotating case
B. The distance between two galaxies
C. The radius of every star
D. The distance between Earth and the Moon
Answer: A
19. If the Sun were replaced by a black hole with exactly the same mass, what would happen to Earth's orbit?
A. Earth would immediately fall into the black hole
B. Earth would fly out of the Solar System
C. Earth's orbit would remain approximately the same, although there would be no sunlight
D. Earth would instantly become a black hole
Answer: C
20. Which black hole was the first one directly imaged?
A. Sagittarius A*
B. M87*
C. Cygnus X-1
D. Gaia BH1
Answer: B
21. In what year was the first image of a black hole revealed?
A. 2009
B. 2014
C. 2019
D. 2023
Answer: C
22. Which organization produced the first black hole image using a global network of radio telescopes?
A. Event Horizon Telescope Collaboration
B. International Space Station
C. James Webb Telescope Team
D. Voyager Mission Team
Answer: A
23. M87* is located in which type of object?
A. A galaxy called Messier 87
B. Earth's Moon
C. The Solar System
D. A globular cluster
Answer: A
24. What does the "shadow" of a black hole refer to?
A. A dark region created by the way gravity bends and captures light around the black hole
B. A physical hole cut into space
C. A cloud of cold gas blocking the entire galaxy
D. A second black hole orbiting the first
Answer: A
25. How can astronomers detect a black hole if it does not emit visible light itself?
A. By observing its effects on nearby matter, light and stars
B. By listening for ordinary sound waves
C. By observing its surface with a normal camera
D. By measuring its temperature from Earth directly
Answer: A
26. Which type of radiation can be produced by extremely hot material around some black holes?
A. X-rays
B. Sound waves
C. Ocean waves
D. Seismic waves
Answer: A
27. What are gravitational waves?
A. Ripples in space-time produced by accelerating massive objects
B. Radio signals sent by astronauts
C. Waves produced only by oceans
D. Light waves that travel through Earth's atmosphere
Answer: A
28. Which observatory famously detected gravitational waves from merging black holes?
A. LIGO
B. Hubble
C. Kepler
D. Voyager
Answer: A
29. What can happen when two black holes merge?
A. They can form a larger black hole and release gravitational waves
B. They always turn into two stars
C. They create a new planet
D. They stop producing gravity
Answer: A
30. What is Hawking radiation?
A. A theoretical form of radiation associated with black holes losing energy
B. Radio waves emitted by the Sun
C. Light produced by ordinary stars
D. Radiation produced only during supernova explosions
Answer: A
31. Which physicist is most closely associated with Hawking radiation?
A. Stephen Hawking
B. James Clerk Maxwell
C. Michael Faraday
D. Edwin Hubble
Answer: A
32. According to the Hawking radiation prediction, what can eventually happen to a black hole?
A. It can slowly lose mass and theoretically evaporate
B. It must grow forever
C. It turns into a star every few years
D. It becomes a galaxy
Answer: A
33. Which black holes are generally expected to evaporate more quickly through Hawking radiation?
A. Smaller black holes
B. Larger supermassive black holes
C. All black holes at exactly the same rate
D. Black holes with the largest galaxies
Answer: A
34. Are black holes actually giant empty holes in space?
A. Yes, they are literally holes through space
B. No, they are extremely dense concentrations of matter and energy
C. Yes, but only supermassive ones
D. No, they are clouds of ordinary gas
Answer: B
35. Do black holes act like cosmic vacuum cleaners that automatically suck in everything nearby?
A. Yes, anything within a galaxy is eventually pulled in
B. No, objects can orbit a black hole safely if they remain outside the relevant capture region
C. Yes, but only planets are affected
D. No, black holes have no gravity outside the event horizon
Answer: B
36. What is a stellar-mass black hole?
A. A black hole with a mass comparable to that of a star
B. A black hole found only inside planets
C. A black hole smaller than an atom
D. A black hole located only outside galaxies
Answer: A
37. What is a supermassive black hole?
A. A black hole with hundreds of thousands to billions of times the Sun's mass
B. A black hole with exactly the mass of Earth
C. A black hole that is physically larger than every galaxy
D. A temporary black hole created by a supernova
Answer: A
38. Which object is thought to be a supermassive black hole at the center of the Milky Way?
A. Betelgeuse
B. Sagittarius A*
C. Polaris
D. Sirius
Answer: B
39. What happens to time as you get closer to a black hole, according to an observer far away?
A. Gravitational time dilation makes the falling clock appear to run more slowly
B. Time completely disappears everywhere
C. Time runs infinitely faster for everyone
D. Time becomes unrelated to gravity
Answer: A
40. What happens to light as it travels through a strong gravitational field?
A. Its path can be bent
B. It automatically stops moving
C. It turns into sound
D. It loses all energy immediately
Answer: A
41. What is a photon sphere?
A. A region around a black hole where light can follow circular paths in idealized conditions
B. The event horizon itself in every type of black hole
C. A sphere made from photons surrounding Earth
D. The center of a galaxy
Answer: A
42. Which statement about an event horizon is correct?
A. It is a solid surface that you could stand on
B. It is a boundary in space-time, not a normal physical surface
C. It exists around every planet
D. It is made entirely of glowing gas
Answer: B
43. What can happen to a star that passes extremely close to a supermassive black hole?
A. It can be torn apart by tidal forces
B. It automatically becomes a planet
C. It becomes invisible without losing matter
D. It turns into a galaxy
Answer: A
44. What is this stellar destruction event commonly called?
A. Tidal disruption event
B. Stellar compression cycle
C. Galactic eclipse
D. Cosmic collapse wave
Answer: A
45. Which famous equation is closely connected with the relationship between mass and energy?
A. E = mc²
B. F = ma
C. V = IR
D. a² + b² = c²
Answer: A
46. Why can astronomers sometimes detect a black hole by watching a nearby star?
A. The star's motion can reveal the gravitational influence of an unseen massive object
B. The star changes into a black hole every night
C. Black holes reflect the star's light directly
D. The star sends radio signals describing the black hole
Answer: A
47. What is one important difference between a black hole and an ordinary star?
A. A black hole has an event horizon from which light cannot escape
B. A black hole contains no mass
C. A black hole has no gravitational field
D. A black hole is always smaller than an atom
Answer: A
48. Which of these is NOT something black holes are known to do?
A. Bend light
B. Merge with other black holes
C. Influence nearby stars through gravity
D. Act as portals that scientists have confirmed can transport people to another universe
Answer: D
49. What did the first image of M87* actually show?
A. A photograph of the singularity itself
B. A bright ring of hot material and a dark central shadow caused by the black hole and surrounding space-time
C. A normal star exploding
D. The entire M87 galaxy in one close-up image
Answer: B
50. Which statement best describes what scientists currently know about black holes?
A. Everything about them has already been completely explained
B. They are only mathematical ideas and have never been observed indirectly
C. Strong observational evidence exists for them, but important questions about their interiors and ultimate physics remain open
D. They are confirmed gateways to other universes
Answer: C
How Did You Score?
Now add up your correct answers and see where you landed.
- 45–50: Black Hole Expert — You clearly know your event horizon from your accretion disk.
- 35–44: Cosmic Thinker — You have a seriously strong understanding of black holes.
- 25–34: Space Explorer — You know the important ideas, but there are still a few cosmic mysteries to brush up on.
- 15–24: Stargazer in Training — You have the basics, and there is plenty more fascinating science to discover.
- 0–14: Just Outside the Event Horizon — Time for another trip into the world of black holes!
What Did This Black Hole Quiz Teach You?
Black holes are much more than mysterious dark spots in space. They give scientists a way to study some of the most extreme effects predicted by modern physics, including the bending of light, gravitational time dilation, tidal forces and gravitational waves.
We can learn about black holes even though light cannot escape from inside their event horizons. Astronomers study the stars and gas around them, observe powerful radiation from nearby material, measure gravitational waves from mergers and use the effects of gravity on light to understand these extraordinary objects.
And there is still plenty we do not know.
What exactly happens deep inside a black hole? How did the first supermassive black holes form? And how can our current theories of gravity and quantum physics eventually fit together?
Those questions are part of what makes black holes so fascinating.
How many did you get right out of 50? Share your score and challenge someone else to beat it.