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What is the name of the curve that represents the history of a particle in spacetime?
Answer
worldline
What is the term for the time measured by a clock moving along its own worldline?
Answer
proper time
What is the name for the path a free-falling object follows in curved spacetime?
Answer
geodesic
What is the mass of the M87 black hole in billions of solar masses?
Answer
6.5 billion
What is the approximate Schwarzschild radius of Earth in millimeters?
Answer
9 mm
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Latest trivia questions
What is the mass of the M87 black hole in billions of solar masses?
Answer
6.5 billion
What is the approximate luminosity distance of the gravitational wave event GW150914?
Answer
1.3 billion light-years
What experiment first measured gravitational redshift using gamma rays on Earth?
Answer
Pound-Rebka experiment
What binary pulsar system provided the first indirect evidence for gravitational waves?
Answer
Hulse-Taylor binary
What theorem states that black holes are fully described by only three parameters?
Answer
No-hair theorem
What NASA mission measured the frame-dragging effect of Earth's rotation?
Answer
Gravity Probe B