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What are the possible origins of the large mass and spin of the black hole merger GW231123?

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Is there a distance at which the light of a star misses the observer

2 votes
2 answers
361 views

What Crayford focuser to buy for a B&L Criterion 8000?

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Do Saros 42 and 118 have a known long-period relationship causing repeated near-identical total eclipse tracks?

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157 views

In Which Locations Would It Be Possible To Have 4 “Constant” Constellations?

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2 answers
231 views

Why aren't Turnbull's top 5 Terrestrial Planet Finder targets in HabCat?

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1 answer
190 views

Is differential rotation continuous?

8 votes
1 answer
2k views

What is the hierarchical orbital architecture of the septuple systems Nu Scorpii and AR Cassiopeiae?

3 votes
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How much of Jupiter's mass is in gaseous state?

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Can we theoretically estimate the number of stars in an open cluster using the IMF?

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How long will the Apollo astronaut footprints remain visible on the lunar surface?

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3 answers
3k views

Why the moon is blinding me right now?

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Will the center of the Milky Way ever be above the Northern sky?

6 votes
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832 views

Find Extreme UV data source for the Sun

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