How do we know what happens at the event horizon of a black hole?
A) Physicists have created miniature black holes in the lab.
B) Astronomers have sent spacecraft through the event horizon of a nearby black hole.
C) Astronomers have analyzed the light from matter within the event horizon of many black holes.
D) Astronomers have detected X-rays from accretion disks around black holes.
E) We don't know for sure: we only know what to expect based on the predictions of general relativity.
E
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Why couldn't life have originated on the Moon or Mercury?
What will be an ideal response?
The wave-particle duality applies to
A) photons. B) electrons. C) protons D) all of the above E) none of the above
Explain how we can estimate that there are about 50-100 billion galaxies in the observable universe
What will be an ideal response?
The Milky Way and other spiral galaxies ____
a. must have formed recently, because they contain young stars b. formed spiral arms as the result of major collisions with other galaxies c. created their disks through the process of galactic cannibalism d. must be very old because they contain so much gas and dust e. cannot maintain their disk structure if they suffer a major collision