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4 votes
0 answers
118 views
Could or has a Ninth planet ever be "formed" in our solar system?
10 votes
5 answers
3k views
Why there are no terrestrial planets with a subsurface ocean?
2 votes
0 answers
52 views
Can JWST be damaged by looking at a bright star?
1 vote
0 answers
28 views
What exactly is the risk to any JWST instrumentation when looking at objects that are "too bright"?
5 votes
1 answer
56 views
The two channels of Type Ia SNe and their use as standard candles
1 vote
1 answer
56 views
Calculating the luminosity of a comet
13 votes
1 answer
1k views
Why HD 84406 will be chosen as the first target for testing JWST?
8 votes
4 answers
286 views
Image sets for testing stacking algorithms?
1 vote
0 answers
32 views
How to choose the right Barlow lens?
1 vote
1 answer
26 views
In shear component $\gamma_1, \gamma_2$ of weak lensing, Why does the defining with $2\phi$ reflect "real angle"?
15 votes
2 answers
167 views
How do we know that the planets of our solar system began their formation at more or less the same time?
25 votes
4 answers
5k views
Which planet came first in our Solar system?
2 votes
2 answers
2k views
Coordinates of known black holes in our Galaxy (Milky Way)
1 vote
0 answers
30 views
Is there an official recommended expression for Doodson arguments?
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