According to conservative estimates, the end of habitability of Earth will come about
A) 3 to 4 billion years from now
B) a few hundred thousand years from now
C) 100 million years from now
D) a billion years from now
D
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Why does the Doppler shift method of detecting extrasolar planets only give us the minimum mass of a planet?
A) because we don't necessarily know the density of the planet B) because we don't necessarily know the angle the planet's orbit makes with our line of sight C) because we don't necessarily know the diameter (size) of the planet D) because we don't necessarily know the mass of the parent star very
The inhabitants of a planet in another galaxy have their eyes at the exact center of their 4.0-m-long bodies. How long must a plane mirror be for such a creature to be able to see all of its body in the mirror?
a. 1.0 m b. 2.0 m c. 2.5 m d. 4.0 m e. 8.0 m
A neutron is an example of
A) a lepton. B) a meson. C) a baryon. D) a gauge boson. E) none of the above.