The visible surface of the Sun is called the
a)chromosphere.
b)photosphere.
c)corona.
d)celestial sphere.
?
b
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If the Moon formed out of the same cloud of material from which Earth formed, what can we predict about the composition of moon rocks collected by Apollo astronauts?
A. Moon rocks should have a completely different composition than rocks found on and inside Earth. B. Moon rocks should have the same composition as rocks found on Earth. C. Moon rocks should have a composition that is the same as Earth's crust. D. Moon rocks should have some similar and some different compositional characteristics.
The first life to originate on Earth must be
A) at least as old as the oldest fossils B) exactly the same age as the oldest fossils C) younger than the oldest fossils D) much older than the oldest fossils
Why can't we see back the whole way to the Big Bang?
a) Radiation is blueshifted out of the visible range. b) It would take too long for light to travel that far. c) Our telescopes could never be powerful enough. d) The radiation scatters off matter frequently so the Universe is opaque. e) Not enough photons were produced.
Which statement about Jupiter is true?
A. It is more massive than all other planets combined. B. It may become a star in about a billion years. C. It is the least dense of the Giant Planets. D. It has a solid core of ice about 1,000 km under the visible surface.