User pela

83 votes

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Is there a better explanation of this picture showing the very distant star "Earendel"?

answered Apr 3, 2022 at 21:58

66 votes

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Why doesn't the moon twinkle?

answered Mar 9, 2016 at 12:01

58 votes

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Why are the Pillars of Creation pillar-shaped?

answered Oct 25, 2022 at 10:16

53 votes

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How do we have photos of galaxies so far away?

answered Sep 10, 2017 at 19:36

48 votes

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Does the sun cross other spiral arms in its movement around the galaxy's center?

answered Nov 12, 2019 at 17:23

48 votes

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Why does the alignment evaluation image from JWST look like this?

answered Mar 17, 2022 at 15:18

44 votes

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Is lithium considered a metal in astronomy?

answered Oct 27, 2020 at 12:03

41 votes

Does the Milky Way move through space?

answered Sep 12, 2017 at 18:19

38 votes

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How far apart are stars in a binary system?

answered Dec 4, 2019 at 13:47

36 votes

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How much larger will the "observable by us" universe be when JWST becomes operational?

answered Apr 2, 2022 at 22:41

35 votes

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How does JWST position itself to see and resolve an exact target?

answered Aug 1, 2022 at 5:43

31 votes

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Why isn't interstellar medium pulled in towards nearest massive object?

answered Oct 9, 2017 at 21:02

29 votes

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How fast are we moving relative to the CMB?

answered Sep 27, 2019 at 13:41

29 votes

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What causes the sharp if irregular boundary line in the "Cosmic Cliffs" JWST Carina image?

answered Jul 16, 2022 at 21:04

28 votes

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Is saying that what we see of an object 1 light-year away happened 1 year "ago" in any a way useful view of the universe?

answered Oct 28, 2021 at 9:50

27 votes

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What is the probability of a photon from one of these galaxies hitting the James Webb detector?

answered Jul 12, 2022 at 22:10

25 votes

What would happen if someone had a telescope and watched Betelgeuse when it goes supernova?

answered Dec 8, 2018 at 23:57

25 votes

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How cold is interstellar space?

answered Jun 1, 2016 at 21:39

25 votes

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Why can we observe the Cosmic Microwave Background no matter the direction we look?

answered Feb 5, 2016 at 12:24

25 votes

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Time according to the gravity of Sagittarius A*?

answered Apr 14, 2015 at 11:35

24 votes

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Could dark matter be wrong?

answered Aug 21, 2018 at 10:25

24 votes

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Could we parallax measure stars just based on the Earth's size?

answered Nov 14, 2016 at 22:37

23 votes

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Martian Constellations

answered Dec 12, 2016 at 16:13

23 votes

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What is this "Table of astronomy" about?

answered Aug 12, 2019 at 13:42

23 votes

Are there any galaxies which fell out of sight horizon due to cosmic expansion?

answered Mar 28, 2016 at 15:06

23 votes

Milky Way vs Milky Way Galaxy

answered Sep 9, 2021 at 13:28

22 votes

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Why will HD 84406 be chosen as the first target for testing JWST?

answered Jan 26, 2022 at 9:53

22 votes

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Will we start seeing galaxies disappear due to Universe expansion?

answered Jan 31, 2017 at 16:55

22 votes

How one can establish that the Earth is round?

answered Jun 29, 2023 at 9:35

22 votes

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Can stars form in the stellar halo?

answered Apr 2 at 11:53

Stack Exchange Network

400 Answers

Is there a better explanation of this picture showing the very distant star "Earendel"?

Why doesn't the moon twinkle?

Why are the Pillars of Creation pillar-shaped?

How do we have photos of galaxies so far away?

Does the sun cross other spiral arms in its movement around the galaxy's center?

Why does the alignment evaluation image from JWST look like this?

Is lithium considered a metal in astronomy?

Does the Milky Way move through space?

How far apart are stars in a binary system?

How much larger will the "observable by us" universe be when JWST becomes operational?

How does JWST position itself to see and resolve an exact target?

Why isn't interstellar medium pulled in towards nearest massive object?

How fast are we moving relative to the CMB?

What causes the sharp if irregular boundary line in the "Cosmic Cliffs" JWST Carina image?

Is saying that what we see of an object 1 light-year away happened 1 year "ago" in any a way useful view of the universe?

What is the probability of a photon from one of these galaxies hitting the James Webb detector?

What would happen if someone had a telescope and watched Betelgeuse when it goes supernova?

How cold is interstellar space?

Why can we observe the Cosmic Microwave Background no matter the direction we look?

Time according to the gravity of Sagittarius A*?

Could dark matter be wrong?

Could we parallax measure stars just based on the Earth's size?

Martian Constellations

What is this "Table of astronomy" about?

Are there any galaxies which fell out of sight horizon due to cosmic expansion?

Milky Way vs Milky Way Galaxy

Why will HD 84406 be chosen as the first target for testing JWST?

Will we start seeing galaxies disappear due to Universe expansion?

How one can establish that the Earth is round?

Can stars form in the stellar halo?