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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?
111Most astronomers believe that these celestial bodies are at the center of quasars and are the main reason for their large energy emissions?
139Whos book, titled concerning the revolutions of celestial spheres, is considered to mark the birth of modern astronomy?
93If 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 long is a day on saturn?
Tell me how long is it until our solar system ceases to exist?
Maria on the moon are?
Name the part of the sun that we can see without any instruments?
The hydrogen envelope that surrounds the comets nucleus derives its hydrogen most directly from?
The magellan clouds are actually what type of celestial body?
A solar eclipse can only occur at?
Tell me how many moons does saturn have?
How many planets are in the new solar system?
Tell us something about your education background as a kid.
Does astronomy help you with other things in life?
What are black holes? Do they exist in reality?
Which is the brighest star?
How did the moon form?
Explain how was the moon formed?
