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Sam langley invented what instrument, which allows astronomers to measure the energy output of the sun and other stars?
133The hydrogen envelope that surrounds the comets nucleus derives its hydrogen most directly from?
208In 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?
253
How many moons do Mars planet have?
What is the distance between two galaxies?
If gravity only attracts mass and if light does not have mass why does it appear to bend when passing a planet?
Explain the venus atmosphere.
What is the density of stars?
What are galaxies?
Explain how have some stars had time to die since the universe began?
Which of the constellations cannot be seen in the summer sky of the northern hemisphere?
Describe how are clouds formed?
Which is the landing craft used by armstrong on the moon?
How many black holes are there?
Is the gravitational pull on an object equalized if the object is at the center of a planet, i.e. Surrounded by the mass of the planet, which is creating the gravity?
When did the challenger return to the earth after its first mission?
What is the difference between a star, satellite and a planet?
Does non-carbon based life exist somewhere in the universe?
