Explain why "the dark side of the Moon" is an incorrect statement
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As the Moon orbits Earth, it rotates to keep the same side facing Earth, so we see the same features of the Moon from Earth, and never see the far side of the Moon. That does not mean, however, that the far side is always in the dark. All parts of the Moon experience day and night in a month-long cycle. Any location on the Moon is sunlit for two weeks and is in darkness for two weeks as the Moon rotates.
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Describe spiral arms
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A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/sec. What is the approximate age of this planetary nebula? (1 pc is equal to 3 x 1013 km and 1 year is equal to 3.15 x 107 seconds.)
a. 240 years b. 790,000 years c. 96,000 years d. 960 years e. 24,000 years
Which is the smallest?
A) The distance from the Sun to the Andromeda Galaxy B) The distance from the Sun to the Virgo cluster of galaxies C) The distance from the Sun to the center of the Milky Way Galaxy D) The Solar System. E) The distance from the Sun to its nearest neighboring sta
What is the intensity of a sound with a measured intensity level of 84 dB? (I0 = 10-12 W/m2)
a. 8.4 × 10^-3 W/m2 c. 2.5 × 10^-5 W/m2 b. 2.5 × 10^-4 W/m2 d. 7.4 × 10^-4 W/m2