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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?
109Most astronomers believe that these celestial bodies are at the center of quasars and are the main reason for their large energy emissions?
137Whos book, titled concerning the revolutions of celestial spheres, is considered to mark the birth of modern astronomy?
89If the temperature of a star increases from 10,000k to 30,000k, by what factor will the rate of energy radiated per second increase?
114
Tell me how many moons do mars have?
Why did you want to become an astronomer?
Astronomers usually detect the electromagnetic emissions of a single neutron star in what single form?
Explain how big is the universe?
Explain how far away from earth, is space?
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?
What is distance from the earth to the moon?
How many moons do Mars planet have?
What do astronomers call the point in the sky that is directly overhead?
How was the moon formed?
Do black holes really exist?
Explain how do clouds form?
Which king of india built an astronomical observatory in 17th century?
Which is the first unmanned space vehicle which landed on the moon?
A meteor that reaches the surface of the earth is more accurately called a?
