Of the terrestrial planets, Mars seems most promising to exobiologists
Indicate whether the statement is true or false
TRUE
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Choose the correct terms to make the statement correct: ___Chemical/Biological__ evolution occurs before __chemical/biological____ evolution
Fill in the blank(s) with correct word
Astronomers believe that most of the matter that makes up the universe is not detected by any part of the electromagnetic spectrum. This mysterious matter is called ______________
Fill in the blank(s) with correct word
The energy transported by a wave is proportional to the square of the frequency of the wave
Indicate whether the statement is true or false
A lunar month is about 28 days. If the Moon were closer to Earth than it now is, the lunar month would be
1) less than 28 days, 2) more than 28 days, 3) still 28 days, mainly because 4) centripetal force would lessen with decreased distance. 5) a closer Moon means an increase in both gravitational force and speed, which in a smaller orbit means shorter time. 6) orbital speed about the center of mass of Earth-Moon system is not dependent upon the distance between Earth and Moon. 7) of tidal friction.