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Sam langley invented what instrument, which allows astronomers to measure the energy output of the sun and other stars?
Mars has a thin atmosphere composed mainly of what gas?
Describe the venus atmosphere 14 how far from earth, is the moon?
Which planet in our solar system has the most circular orbit?
The hydrogen envelope that surrounds the comets nucleus derives its hydrogen most directly from?
What are the only two planets to rotate from east to west?
In the doppler effect, what is the correct term for the change in the color of light when an object that is emitting light is moving toward the observer?
Which moon is the only other body in our solar system, besides the earth, that has an atmosphere of mostly nitrogen?
A meteor that reaches the surface of the earth is more accurately called?
The persieds meteor showers are viewed in the state of maine during what month?
Explain how far from earth, is the moon?
Explain how did the moon form?
Explain how is saturn like earth?
Tell me how many moons does uranus have?
Explain how old is this universe?
