Calculate the Earth's angular momentum in the approximation that treats the Earth's orbit around the sun as a circle. (MSun = 1.99 × 10^30 kg; T = 3.156 × 10^7 s; ME = 5.98 × 10^24 kg.)
2.67 × 10^40 kg×m2/s
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A stable cloud colliding with a shock wave can be compressed and disrupted into fragments
Indicate whether the statement is true or false
Why are collisions between galaxies more likely than collisions of stars within galaxies?
A) Relative to their sizes, galaxies are much closer together than stars. B) Galaxies are much larger than stars. C) Galaxies travel through space much faster than stars. D) Galaxies have higher redshifts than stars.
Which of the following electromagnetic waves are completely blocked by Earth's atmosphere?
A. X-rays B. infrared C. radio waves D. visible light
Which of the following is not true of Mercury?
A) It has many moons. B) At any given time, about half the planet is colder than Antarctica. C) Its surface is heavily cratered. D) Mercury has essentially no atmosphere.