Dark Mystery of the Universe

Quiz

Dark Mystery of the Universe Quiz

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1: What is the escape velocity at the event horizon of a black hole?: The speed of light
The speed of sound
Warp six
2: Black holes can be formed by the gravitational collapse of which astronomical objects?: Large planets like Jupiter
Stars about the size of our Sun
Stars much heavier than our Sun
3: How do astronomers know when they are observing a black hole?: When they see the light emitted from nearby dust and gas being sucked into the black hole
When they hear the screams of people falling into the black hole
When everything in that region of space is completely black
4: Which statement below is true as far as the theory of black holes is concerned?: In classical theory black holes always decay but in quantum theory they never decay.
In classical theory black holes never decay but in quantum theory they always decay.
In classical theory black holes always decay and in quantum theory they decay even faster.
5: What would change if our Sun was suddenly replaced by a black hole of the same mass?: Earth would be sucked into the black hole
The planets would no longer have the same orbit
Only the temperature on Earth would change
6: Scientists only began to speculate on the existence of black holes in the twentieth century.: True
False
7: If a space probe could be sent into a black hole, it could transmit images back to Earth.: True
False