While featureless in visible light, we can see some detail in Venus' clouds using
A) radio waves.
B) ultraviolet light.
C) X-rays.
D) infrared radiation.
E) gamma rays.
B
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If eclipses occur in repeatable patterns, then explain why an eclipse is not visible from the same place on Earth after one Saros cycle
What will be an ideal response?
When did humans learn that the Earth is not the center of the universe?
A) within the past 500 years B) about 2,500 years ago C) about 1,000 years ago D) We haven't; there is still considerable scientific debate about whether Earth is the center of the universe.
Compared to orbital velocity, escape velocity is about:
A) the same. B) 70% less. C) 40% more. D) twice as large. E) four times greater.
How do we know that there is much more mass in the halo of our galaxy than in the disk?
A) There are so many globular clusters in the halo that their total mass is greater than the mass of stars in the disk. B) Stars in the outskirts of the Milky Way orbit the galaxy at much higher speeds than we would expect if all the mass were concentrated in the disk. C) Although the question of mass in the halo was long mysterious, we now know it exists because we see so many brown dwarfs in the halo. D) The recent discovery of photinos, combined with theoretical predictions, tells us that there must be a huge mass of photinos in the halo. E) We don't know that there is more mass in the halo; it is only a guess based on theory.