A simple method of measuring the distance between the Earth and the Moon is to place in your line of sight to the Moon a
A) magnifying glass.
B) coin.
C) telescope.
D) meterstick.
Answer: B
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In radio galaxies, the main source of radio emissions is a small region at the center of the galaxy.
Answer the following statement true (T) or false (F)
Light travels for about ________ to reach the Sun's surface from the Sun's core, and about ________ to reach Earth from the Sun's surface.
A. 1 minute; 8 seconds B. 100 years; 8 minutes C. 100 years; 8 seconds D. 16 million years; 8 minutes
When a light beach ball rolling with a speed of 6 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be approximately
A) 3 m/s. B) 12 m/s. C) 6 m/s. D) 18 m/s. E) 0.
Main sequence stars are in hydrostatic equilibrium.
Answer the following statement true (T) or false (F)