Kirkwood gaps in the asteroid belt occur at distances where
A) the density of asteroids is high enough for a large collision to pulverize a number of asteroids.
B) the period of an orbiting asteroid would be a simple fraction (like 1/3 or 1/4 ) of Jupiter's orbital period.
C) the period of an orbiting asteroid would be the same as Mars's orbital period.
D) the orbit would take the asteroid beyond the "frost line" in the solar system.
E) the period of an orbiting asteroid would be the same as Jupiter's orbital period.
B
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The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid water-rich world. b. the climate on Mars was different billions of years ago. c. volcanism is occurring on Mars. d. the polar caps are made of liquid water. e. all of the above
Time Dilation: A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth. Biologically speaking, at the end of the mission, the astronaut's age would be
A. more than 50 years. B. exactly 50 years. C. less than 50 years. D. exactly 30 years. E. exactly 25 years.
The photons having least energy are those of
A) infrared. B) red light. C) green light. D) blue light. E) ultraviolet.
The 90°W longitude meridian is the center of the ______________ Standard Time zone in the United States
a. Pacific b. Mountain c. Eastern d. Central