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1 answer
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Methods for determining the extent of an open cluster

4 votes
3 answers
2k views

Is Venus in our sun's habitable zone?

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S2 orbit - orientation relative to our line of sight

3 votes
0 answers
147 views

Orbital planes of stars in the S-cluster; are they edge-on?

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18 views

Converting spectral luminosity density to absolute AB magnitude

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128 views

What are the black regions in this image?

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739 views

Closest path of solar eclipse central line

7 votes
3 answers
3k views

Don't all roads lead to heat death?

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1 answer
116 views

Separating stellar rotation from stellar activity in spectral analysis

1 vote
1 answer
158 views

What's the difference between Adaptive Optics and Active Optics?

8 votes
3 answers
2k views

How do we keep track of the positions of stars that are light years away?

-3 votes
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189 views

Corona of the Sun vs Sun vs Betelgeuse

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1k views

Red Shift Puzzle

20 votes
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2k views

How did Geocentric Models (Aristotle, Ptolemy) explain the conjunctions of the inner planets?

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