Strictly speaking, Newton's law of universal gravitation, F = Gm1m2/r2, is valid only if the masses are either point masses or ________.
What will be an ideal response?
perfect (uniform) spheres
perfect spheres
spheres
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What do scientists believe created the asteroid belt during Solar System formation?
What will be an ideal response?
What category do astronomers use if a galaxy does not fit into the spiral or elliptical category?
A: Giant. B: Funny. C: Dwarf. D: Irregular. E: Primordial.
Suppose Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be
A) 250 K, which is well below freezing. B) 273 K, or about the freezing point for water. C) 283 K, or about 5 K cooler than it is now. D) 288 K, or about the same as it is now. E) 293 K, or about 5 K warmer than it is now.
For nearby spirals, their rotation curves help measure both light and dark matter
Indicate whether the statement is true or false