What was the temperature of the Universe when the recombination took place that produced the cosmic background radiation we observe today?
a. about 2.7 K
b. about 300 K
c. about 3000 K
d. about 3 million K
e. about 3 billion K
c
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Although it is greatly exaggerated as shown, what real effect does this diagram show?
A) The perihelion and aphelion of Mercury's orbit gradually precesses around the Sun. B) Time runs slow on Mercury. C) Mercury has a spiral shaped orbit around the Sun. D) Mercury will eventually fly off into space.
The equation H2O2 ? H2O + O is not correctly written because
a. the number of atoms of each element on each side is not the same. b. the mass indicated on each side is not the same. c. oxygen is diatomic. d. hydrogen peroxide decomposes to H2O and H.
What is an extrasolar planet?
A) a planet that orbits a star that is not our own Sun B) a planet that is larger than the Sun C) a planet that is extra large compared to what we'd expect D) a planet that is considered an "extra," in that it was not needed for the formation of its solar system
What is the Gulf Stream?
What will be an ideal response?