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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
Which planet in our solar system has the most circular orbit?
If gravity only attracts mass and if light does not have mass why does it appear to bend when passing a planet?
What is difficult about being an Astronomer?
The apparent speed of the sun along the ecliptic is known as?
What are gamma ray bursts?
Do black holes really exist?
Explain is pluto really a planet?
How many stars are there, which are normally visible?
Tell me how long is a day on saturn?
The hydrogen envelope that surrounds the comets nucleus derives its hydrogen most directly from?
Describe the atmosphere on Venus, Mar and Jupiter.
Is the moon escaping the earth?
Explain 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.
Explain how was the moon formed?
