The singularity of a black hole is
A) where general relativity predicts the density to be zero.
B) where the current understanding of gravity is incomplete.
C) the point at which nothing, not even light, can escape.
D) the region between the Schwarzschild Radius and the event horizon.
B
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Astronomy has shown us that the Earth
A) occupies a special location in the universe so that life elsewhere is unlikely B) is the only planet in the universe with any kind of life C) is the only planet in the universe with advanced life D) is just one planet orbiting an ordinary star in a vast universe
The dark halo is now believed to extend at least
A) 100,000 light-years. B) 50 kpc. C) 8 kpc. D) 15,000 light-years. E) 15 kpc.
Aberration: Chromatic aberration in lenses is due to the
A. reflection of light by the lens. B. refraction of light by the lens. C. dispersion of light by the lens. D. polarization of light by the lens. E. None of the other choices is correct.
If you wish to spear a fish with a regular spear, you should compensate for refraction and throw your spear
A) directly at the sighted fish. B) above the sighted fish. C) below the sighted fish.