The fact that we don't see very many Earthlike planets in orbit around other stars is an indication that Earthlike planets are rare
Indicate whether the statement is true or false
FALSE
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Which of the following represent the oldest stars of the Milky Way?
A) the Sun and other stars with similar mass B) O stars C) red giant stars in spiral arms D) Cepheid variable stars E) stars in globular clusters
It is very cold, but otherwise comfortable. You breathe deeply. Although there is no oxygen, the air pressure is quite tolerable and seems almost Earth-like (because it is mostly nitrogen)
Your vista includes the breathtaking sights of an ocean of liquid methane and methane-snow-capped mountains (although the atmosphere is very smoggy, and the visibility is limited). Your solar day is about 16 Earth days long. A large, ringed object seems to hang in your sky, never rising or setting; however, it does go through phases from new to full and back to new again with the same 16-day period as the rising and setting of the Sun.
The absence of folded mountain ranges on Mars suggests that it has been subjected to plate tectonics
a. True b. False Indicate whether the statement is true or false
Dirty bombs may be less of a threat than people fear, because
A. once spread out, the rem level drops below the radiation illness threshold B. dirty bombs require plutonium, and that is hard for terrorists to obtain C. the radioactivity is too small to induce cancer D. the radiation does not actually get out of the bomb case, even when exploded