Why has Mercury traditionally been such a hard planet to observe and study?
What will be an ideal response?
There are two reasons. First, Mercury is a very small planet, so it never appears very large in telescopes. Second, because it orbits so close to the Sun, it can never be viewed under favorable conditions. It is always seen near the horizon, through a lot of atmosphere which distorts its image. Whenever it is in a favorable position for viewing, so is the Sun!
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What kinds of atomic nuclei formed during the nucleosynthesis era?
A) only hydrogen B) essentially all of the chemical elements, except for those heavier than uranium C) roughly equal amounts of hydrogen, helium, lithium, beryllium, and boron D) only helium E) hydrogen, helium and trace amounts of lithium, beryllium, and boron
According to the special theory of relativity, all laws of nature are the same
A) in all reference frames. B) for both linear or circular motion. C) in all uniformly moving reference frames. D) all of the above E) none of the above
According to Kepler's third law (p2 = a3), how does a planet's mass affect its orbit around the Sun?
A) More massive planets orbit the Sun at higher average speed. B) A planet's mass has no effect on its orbit around the Sun. C) More massive planets must have more circular orbits. D) A more massive planet must have a larger semimajor axis.
The greenhouse effect is bad for Earth
a. True b. False Indicate whether the statement is true or false