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Sam langley invented what instrument, which allows astronomers to measure the energy output of the sun and other stars?
129The hydrogen envelope that surrounds the comets nucleus derives its hydrogen most directly from?
206In 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?
175Which moon is the only other body in our solar system, besides the earth, that has an atmosphere of mostly nitrogen?
238
Do black holes really exist?
The kappa cygnids and the northern delta aquarids are names for what phenomena?
What term is most commonly used to refer to the actual motion that stars have in relation to each other, and over many years will lead to changes in the shapes of constellations?
How many moons does neptune have?
The hydrogen envelope that surrounds the comets nucleus derives its hydrogen most directly from?
Mars has a thin atmosphere composed mainly of what gas?
When did solar system come into existence? What is the expected life of solar system?
Explain how have some stars had time to die since the universe began?
What is difficult about being an Astronomer?
Explain the venus atmosphere.
Tell me how long is it until our solar system ceases to exist?
How do clouds form?
What is the constant called that is the average flux of the suns energy arriving at the earth?
What is the effect of gravity at the center of a planet?
Tell me how many earths can fit into jupiter s great red spot?
