It sure is bright everywhere; you've been able to travel around a bit, and it's clear that you are not in a star. Yet it is as bright as looking directly at the Sun
In your extensive travels through your current surroundings, you cannot find a single neutral atom anywhere, nor can you find a nucleus besides hydrogen or helium. And, while it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you? A) You are in the universe during its first 300,000 years.
B) You are in the universe more than 10100 years in the future.
C) You are in an accretion disk around a supermassive black hole.
D) You are in the central regions of a quasar.
E) You are where the Sun should be located, but about 5 billion years from now.
A
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Of the Galilean satellites, which has the oldest, most heavily cratered surface?
A) Titan B) Io C) Europa D) Callisto E) Ganymede
The oldest intact rocks found on Earth date back to approximately
A) 4.57 billion years ago B) 3.85 billion years ago C) 4.38 billion years ago D) 4.02 billion years ago
In the greenhouse effect, what is the direct cause of extra heating of the Earth's surface?
A) Additional carbon dioxide makes the atmosphere more opaque to infrared light, trapping part of the blackbody radiation that would normally escape into space. B) Additional carbon dioxide makes the atmosphere more transparent to infrared light, allowing the sun to more directly heat the surface. C) Additional carbon dioxide makes the atmosphere denser, and thus heat passes through it more slowly.
The sharply defined boundary that separates the crust from the mantle is called ______________
a. the lithosphere b. the asthenosphere c. the Mohorovicic discontinuity d. none of the above.