Contrast the orbits of asteroids and Kuiper Belt bodies
What will be an ideal response?
Both types stay close to the ecliptic plane, but the asteroids are much closer in, usually between Mars and Jupiter, while the Kuiper objects lie beyond the orbit of Neptune.
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When white light passes through a cool cloud of gas, we see
A) visible light. B) infrared light. C) thermal radiation. D) an absorption line spectrum. E) an emission line spectrum.
Protostars are difficult to observe because
a. the protostar stage is very short. b. they are surrounded by cocoons of gas and dust. c. they radiate mainly in the infrared. d. all of the above e. they are all so far away that the light hasn't reached us yet.
Biomass should not be used to produce feedstocks because of the energy expense involved
What will be an ideal response?
Many galaxies with erupting black holes are found ____
a. in poor clusters with little intergalactic gas b. isolated in space c. in one of a pair of orbiting galaxies d. very close to the Milky Way galaxy e. in the Local Group