The yearly motion of celestial objects in the sky is caused by
A) the rotation of our planet about its axis.
B) the revolution of our planet around the Sun.
C) the movement of our planet within the Milky Way.
D) the tilt of Earth's axis.
Answer: B
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Why does Jupiter have several distinct cloud layers?
A) Different gases are present at different altitudes in Jupiter's atmosphere.
B) Clouds form randomly, so on average there are always several layers.
C) Different layers represent the various regions where the temperature is cool enough for liquid water to condense.
D) Winds prevent clouds from forming at some altitudes, so we see clouds only at the other altitudes.
E) Different layers represent clouds made of gases that condense at different temperatures.
As a result of the ejection of planetesimals into the Oort Cloud, simulations indicate that Uranus and Neptune moved:
A) closer to the Sun. B) further from the Sun. C) along their orbits at a different rate. D) from the inner solar system to the outer solar system. E) from the outer solar system to the inner solar system.
The Orion Nebula glows strongly in the infrared
Indicate whether the statement is true or false
Which Big Bang "puzzles" does the inflationary model resolve?
A. The cosmic background radiation is smooth, but the distribution of matter in the Universe is lumpy. B. The energy of expansion is almost exactly equal to the collective gravitational force between galaxies. C. The Universe is all ordinary matter with almost no antimatter. D. All of these choices are correct.