What boundary around a black hole is the point of no return for light and matter?
Answer
Event horizon
79 Black Holes Trivia Questions with Answers
79 public questions with answers, drawn from the well. How many can you answer?
Black holes trivia explores the boundaries, mathematics, observations, and violent cosmic events associated with these extreme objects. Questions cover the event horizon, the no-hair theorem, rotating black holes, Hawking radiation, and models of gravitational collapse. The hub also connects theory with observation, from the Milky Way’s central compact object to gravitational-wave detections.
With 79 questions, this collection suits astronomy students, physics enthusiasts, science communicators, and quiz teams ready for more than basic space facts. It includes the astronomers behind major discoveries, the Italian Virgo detector’s role in GW170814, and the date the first directly detected black-hole merger signal was observed. It fits a classroom review, science pub quiz, or advanced game night.
Which 1939 model describes collapse of a uniform dust sphere into a black hole?
Answer
Oppenheimer-Snyder model
On what date was the GW150914 black-hole merger signal detected?
Answer
September 14, 2015
What event occurs when a star is torn apart by a black hole's tidal forces?
Answer
Tidal disruption event
What radius gives the event horizon size of a non-rotating black hole?
Answer
Schwarzschild radius
What glowing disk of orbiting gas can surround a feeding black hole?
Answer
Accretion disk
Which 2009-launched ESA telescope studies black holes at far-infrared wavelengths?
Answer
Herschel Space Observatory
Which physicist gave his name to black hole radiation predicted in 1974?
Answer
Stephen Hawking
What kind of object is Sagittarius A*?
Answer
Supermassive black hole
Which theory of gravity first predicted black holes as solutions to its field equations?
Answer
General relativity
For a Schwarzschild black hole, the photon sphere lies at how many Schwarzschild radii?
Answer
1.5 Schwarzschild radii
Which process can power black hole jets by extracting rotational energy through magnetic fields?
Answer
Blandford-Znajek process
What hypothetical black hole type could have formed soon after the Big Bang?
Answer
Primordial black hole
Which exact solution describes a black hole that has both electric charge and rotation?
Answer
Kerr-Newman metric
Which French scientist independently suggested dark stars in 1796?
Answer
Pierre-Simon Laplace
Which English natural philosopher proposed "dark stars" in 1783?
Answer
John Michell
Which physicist popularized the term "black hole" in 1967?
Answer
John Archibald Wheeler
Which solution describes a charged, non-rotating black hole?
Answer
Reissner-Nordström metric
What is the outer boundary of a rotating black hole's ergosphere called?
Answer
Static limit
What is the name for a black hole whose mass is millions to billions of solar masses?
Answer
Supermassive black hole
What theorem says black holes are characterized only by mass, charge, and angular momentum?
Answer
No-hair theorem
What mass class lies between stellar black holes and supermassive black holes?
Answer
Intermediate-mass black hole
Which 1916 solution describes spacetime outside a spherical non-rotating mass?
Answer
Schwarzschild metric
Black Holes trivia — quick answers
What are good black hole trivia questions?
Good black hole trivia questions cover event horizons, singularities, accretion disks, rotation, Hawking radiation, gravitational waves, landmark astronomers, and major observations. Questions about the Kerr metric, the no-hair theorem, Virgo, and GW150914 combine theory, history, and detection.
How hard is black hole trivia?
Black hole trivia is often intermediate to advanced because it combines astronomy with general relativity and mathematical physics. Introductory questions focus on event horizons and observations, while harder questions ask about vacuum states, collapse models, spacetime metrics, and gravitational-wave events.
What is an event horizon?
An event horizon is the boundary surrounding a black hole beyond which events cannot affect an outside observer. Once matter or light crosses it, escape would require exceeding the speed of light. The event horizon is not a solid surface; it is a one-way causal boundary in spacetime.
What are the three quantities in the no-hair theorem?
The no-hair theorem states that an isolated black hole can be completely described by mass, electric charge, and angular momentum. This summarizes the idea that details of the matter that formed the black hole disappear from the externally measurable description, leaving only these macroscopic properties.
What was GW150914?
GW150914 was the first directly detected gravitational-wave signal, observed on September 14, 2015. It came from the merger of two black holes and was detected by the LIGO observatories. The event provided the first direct evidence of gravitational waves and the first observed binary black-hole merger.