Hottest Questions This Month - Astronomy Stack Exchange

8 votes

4 answers

5k views

Are the North Star and the moon ever visible in the night sky at the same time?

CommunityBot

1

modified Jul 15 at 17:30

15 votes

3 answers

5k views

Why is Uranus colder than Neptune?

Andrew T.

111

modified Jul 4 at 0:54

14 votes

2 answers

4k views

Are there really half-a billion visible supernovae exploding all the time?

Pere

1,810

modified Jun 27 at 10:55

4 votes

2 answers

2k views

Can a star be made of sun spots?

DaveTheWave

129

modified Jul 16 at 16:32

13 votes

2 answers

3k views

In the onion-like elemental layers of a large mature star the neon is closer to the surface than oxygen, even though it is more massive... Why?

ProfRob

156k

modified Jul 14 at 15:09

11 votes

2 answers

2k views

Always orient a sundial towards polar north?

Ralf Kleberhoff

1,519

modified 6 hours ago

6 votes

2 answers

2k views

Why does c show up in Schwarzschild's equation for the horizon radius?

user121330

261

modified Jun 27 at 16:16

5 votes

4 answers

2k views

Could two moons orbit each other around a planet?

RokeJulianLockhart

103

modified Jul 7 at 2:05

12 votes

1 answer

959 views

Are any Population III stars red dwarfs?

pela

38.9k

modified Jul 13 at 9:52

4 votes

1 answer

581 views

Finding a paper that has only abstract on ADS

HDE 226868♦

37.3k

answered Jun 23 at 13:37

5 votes

1 answer

734 views

What does HJD-2450000 mean?

James K

126k

answered Jul 18 at 7:38

4 votes

1 answer

1k views

How close would a quasar have to be to be seen with the naked eye?

ArchiveOfStars

305

modified Jul 7 at 4:56

5 votes

1 answer

320 views

How will a planet on asteroid belt see Jupiter?

James K

126k

answered Jul 10 at 17:09

2 votes

1 answer

346 views

What is the best catalog of black hole candidates?

Rory Alsop

5,100

modified Jun 29 at 10:38

0 votes

1 answer

141 views

If the lunar maria are impact craters, why don't they have central peaks?

HDE 226868♦

37.3k

modified Jun 28 at 10:42

2 votes

2 answers

177 views

Can we detect gravitational waves from galaxies merging?

James K

126k

modified Jul 15 at 7:11

3 votes

3 answers

218 views

Why don’t runaway stars happen more often?

Miss_Understands

1,250

modified Jun 26 at 10:18

5 votes

1 answer

236 views

How can you calculate the distance to an object knowing its cosmological redshift? (without Hubbles law)

Walter

5,659

modified Jul 16 at 19:24

-1 votes

2 answers

128 views

What is _now_ on planet in another galaxy?

Miss_Understands

1,250

modified Jul 14 at 15:14

1 vote

1 answer

243 views

Is this a galaxy?

ProfRob

156k

answered Jul 4 at 11:34

3 votes

0 answers

422 views

Are there any video/audio recordings of the launch of sputnik 1? [migrated]

Connor Garcia♦

16.3k

modified Jul 8 at 15:59

-1 votes

1 answer

148 views

Does a football field size asteroid really fall past the moon once a week?

Darth Pseudonym

4,721

modified Jul 5 at 0:50

1 vote

3 answers

108 views

Does the spacetime interval metric define spacetime as necessarily anti desitter?

benrg

3,914

answered 2 days ago

2 votes

1 answer

185 views

Last Thursday's mile-wide asteroid that missed: what angle would it have hit?

Woody

1,121

modified Jul 8 at 18:02

-1 votes

1 answer

141 views

CMB redshift used to determine the difference in aging between the two inertial observers

James K

126k

answered Jul 17 at 6:29

2 votes

1 answer

84 views

What is the relationship between core temperature and surface temperature in main-sequence stars?

planetmaker

20k

modified Jul 12 at 12:58

2 votes

1 answer

98 views

What exactly does $k\sigma$ mean in astrophysics and cosmology?

Lenard Kasselmann

151

modified Jul 5 at 10:48

3 votes

2 answers

118 views

Why don't stars 0.5<m<0.8 solar masses undergo a helium flash?

ProfRob

156k

answered Jun 29 at 6:20

-3 votes

1 answer

503 views

Inconsistency between Velocity vs Redshift and Scale Factor vs Time plots

Nicram Alatiws

1

modified 5 hours ago

-2 votes

2 answers

109 views

What is the nature of magnetism within and without the Galatic plane?

eshaya

4,493

modified Jul 5 at 20:56

3 votes

1 answer

75 views

Pyephem equivalent when living on Mars?

uhoh

30.7k

answered Jul 1 at 6:41

2 votes

1 answer

123 views

Why do so many moons in the solar system orbit retrograde?

Woody

1,121

modified Jul 8 at 2:05

-2 votes

0 answers

147 views

Universe age and cosmological time dilation throughout intergalactic space

Nicram Alatiws

1

modified Jul 16 at 12:20

4 votes

1 answer

89 views

Required temperature for a nova

Peter Erwin

17.3k

modified 2 days ago

2 votes

0 answers

146 views

Light flashes in night sky with a ~14 second period?

Rafa

371

modified Jun 28 at 9:00

4 votes

1 answer

88 views

How could a new cosmological model solve the hubble tension?

Allure

4,719

answered Jun 25 at 9:19

3 votes

1 answer

88 views

Why does the blue loop occur?

Walter

5,659

answered Jul 15 at 8:29

1 vote

1 answer

110 views

Metallicity of Celestial Objects: Why "Metal = Non-metal" Source

LDM

11

answered Jul 16 at 10:17

1 vote

0 answers

110 views

The Julian Day Bug

Pierre Paquette

7,549

asked Jul 10 at 22:25

0 votes

1 answer

60 views

What's the name of the projection onto the celestial sphere of the tropic of cancer?

DavidWalley

213

answered Jun 24 at 22:05

2 votes

1 answer

75 views

Request for Information on how to make a FITS Image

astroR2

11

answered Jul 10 at 6:39

0 votes

0 answers

74 views

How does one determine the cardinal direction in which analemma was photographed?

Christian

1

modified Jul 5 at 15:14

0 votes

1 answer

74 views

Moon's ecliptic latitude and longitude [duplicate]

Rory Alsop

5,100

modified Jul 4 at 18:44

2 votes

1 answer

56 views

How to count observable number of galaxies at a given latitude considering interstellar extinction?

ProfRob

156k

answered Jul 16 at 18:55

3 votes

0 answers

70 views

How to find the minimum range at which some imaging payload/instrument can produce a clear image?

Dhruv Nayak

765

asked Jul 1 at 13:34

2 votes

0 answers

69 views

Using prospector for jwst data

Walker

51

modified Jul 8 at 4:27

6 votes

0 answers

52 views

Historically, when were the terrestrial planets first called terrestrial planets?

oaklight37

61

modified 2 days ago

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