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16 votes
2 answers
2k views

How many galaxies have been discovered?

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9 votes
2 answers
3k views

Why you use log to measure metallicity in galaxies?

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5 votes
1 answer
872 views

Astronomy Olympiad Books

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4 votes
2 answers
2k views

Stellar mass of galaxies

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3 votes
1 answer
113 views

speed of light measurement

3 votes
2 answers
972 views

What is the axial tilt of a planet measured relative to?

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2 votes
1 answer
101 views

Where can I learn these Astrophysical techniques? [Read below]

1 vote
2 answers
968 views

How do astronomers estimate the total mass of dust in clouds and galaxies?

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