Hottest Questions This Month

26 votes

6 answers

6k views

Definition of a moon in an exam: "A satellite of a planet that doesn't produce light itself but reflects it" - is there relevance for the emphasis?

James K

115k

modified Nov 16 at 22:21

7 votes

3 answers

2k views

Distance of the Crab nebula and the speed of light

ProfRob

146k

modified Nov 7 at 17:19

14 votes

2 answers

3k views

why is it impossible to infer the surface temperature of Venus by spectroscopy observation from earth？

Tanner Swett

418

answered Nov 25 at 22:15

28 votes

1 answer

5k views

Is the dark side of the earth protected from the risks of solar flares?

Furious Arcturus

2,585

answered Nov 13 at 14:48

8 votes

5 answers

2k views

Does the escape velocity formula take into account how a gravitationally bound object's distance to its primary increases before coming back down?

Cort Ammon

283

answered Nov 12 at 20:10

4 votes

4 answers

4k views

What is the ring of light around the moon and which star seen near it?

scottbb

161

modified yesterday

11 votes

1 answer

5k views

Why did Theia create only one moon if it struck Earth?

JiK

103

modified Nov 7 at 18:02

9 votes

1 answer

3k views

Why did the dust between the planets disappear during the birth of the solar system?

ProfRob

146k

modified Nov 22 at 14:57

3 votes

1 answer

2k views

Could the Methuselah star be evidence that there was a universe before this one?

Migmanychion

21

modified Nov 10 at 16:50

4 votes

5 answers

3k views

Could the human body feel the sudden disappearance or end of a gravitational force?

muru

109

modified Nov 18 at 2:24

9 votes

1 answer

1k views

Why would rocky earth-like planets be rare around white dwarf stars?

ProfRob

146k

modified Nov 6 at 14:49

10 votes

1 answer

1k views

Is Venus' north towards Earth's south

James K

115k

answered 17 hours ago

4 votes

3 answers

974 views

Celestial "orbits"

Pierre Paquette

6,701

answered Nov 24 at 6:51

5 votes

1 answer

1k views

Realistic description of a sunrise viewed from the asteroid belt?

Pierre Paquette

6,701

modified Nov 5 at 23:08

4 votes

6 answers

403 views

Gravitational waves vs. "normal gravity"

eshaya

3,318

modified 2 days ago

2 votes

3 answers

283 views

Integration of Plank curve of the Sun

planetmaker

17.1k

modified yesterday

7 votes

1 answer

530 views

Is there a formula for calculating surface temperature of a rocky world based on atmosphere and solar input?

AtmosphericPrisonEscape

9,757

modified Nov 9 at 9:40

3 votes

1 answer

406 views

Radiation pattern of a GW source

ProfRob

146k

modified Nov 8 at 21:27

2 votes

1 answer

359 views

How did the temperature of the solar system evolve?

ProfRob

146k

modified Nov 15 at 9:13

3 votes

1 answer

511 views

If you are in a deep gravity well, where time goes by more slowly, do you see the unfolding of a cosmic event at a different rate?

ProfRob

146k

answered Nov 11 at 8:27

-3 votes

3 answers

227 views

Can black holes even exist [if mass cannot be retained near the collapse threshold]?

HDE 226868♦

36k

modified Nov 14 at 23:24

1 vote

1 answer

163 views

A mysterious signal at 14.2054 µHz

ProfRob

146k

modified Nov 5 at 16:53

5 votes

1 answer

423 views

Reasonable stellar body stats

ProfRob

146k

answered Nov 20 at 20:57

2 votes

3 answers

129 views

How can Kerr black holes have a 'speed limit' to how fast they can spin?

TimRias

2,511

answered Nov 16 at 11:01

4 votes

1 answer

147 views

Could a Martian observer witness the Moon's formation with naked eye?

Anders Sandberg

14k

modified Nov 1 at 16:02

4 votes

1 answer

219 views

Where can i find dark frames in the ESO archive?

astrosnapper

8,313

answered Nov 12 at 5:56

3 votes

2 answers

128 views

Instead of a 4 meter diameter, 50 liter spinning pool of dangerous mercury, why didn't the ILMT just use an ionic liquid? Or gallium?

Jon Custer

566

answered 9 hours ago

3 votes

1 answer

323 views

Extinction Level Event (Asteroid Impact Hypothesis) Likelihood Equation

Anders Sandberg

14k

answered Nov 13 at 16:59

2 votes

1 answer

311 views

If w bosons can create dark matter neutrinos by decay, can they also create dark energy?

Anders Sandberg

14k

answered Nov 9 at 10:48

1 vote

1 answer

165 views

Did I see a meteorite in daylight? (4.30pm on 11/6/23

BobCleland

11

modified Nov 12 at 23:07

0 votes

2 answers

145 views

Why do we not call black holes black stars or dark stars?

John Doty

1,297

answered Nov 24 at 22:37

4 votes

1 answer

234 views

How long would we survive an approaching neutron star?

ProfRob

146k

modified Nov 16 at 8:32

5 votes

1 answer

73 views

What are the effects of mass concentration along a planet's axis of rotation?

Jean-Marie Prival

1,732

answered Nov 9 at 9:42

3 votes

1 answer

240 views

Are there any estimates of the Roche Limit for 152830 Dinkinesh?

ProfRob

146k

modified Nov 8 at 16:06

3 votes

1 answer

157 views

Do the Galilean moons' orbits around the Sun have loops (i.e. have concave parts)? And if so, how can their orbits be graphed?

planetmaker

17.1k

modified Nov 25 at 10:35

3 votes

2 answers

113 views

Spiral Galaxies

pela

37k

modified Nov 16 at 14:00

4 votes

2 answers

140 views

Are there naked eye binary stars with periods less than 100,000 years?

planetmaker

17.1k

modified Nov 18 at 13:16

3 votes

1 answer

108 views

Is an earth-sized moon orbiting a super-earth feasible?

Michael_1812

1,221

modified Nov 9 at 17:26

3 votes

1 answer

100 views

How much mass did the Late Heavy Bombardment add to Mars?

Michael_1812

1,221

modified 6 hours ago

1 vote

1 answer

130 views

How close can Venus be to the sun in the sky and still be visible to the naked eye?

PM 2Ring

13.1k

modified Nov 4 at 5:11

1 vote

1 answer

78 views

Can you identify the source of this image of the Pacman Nebula (NGC 281)?

zephyr

14.9k

modified Nov 6 at 20:33

2 votes

2 answers

71 views

Size of the solar system relative to exosystems

M. A. Golding

7,411

answered 2 days ago

1 vote

1 answer

67 views

Plotting scatter graphs with fits binary file?

astrosnapper

8,313

modified Nov 22 at 0:22

0 votes

1 answer

105 views

If 42000 Starlink satellites interfere with telescope observations from Earth would someone observing from another solar system detect them too?

astrosnapper

8,313

modified Nov 10 at 4:23

1 vote

1 answer

76 views

Why does the metallicity of stars decrease with increasing galactocentric radius and height above the galactic plane?

ProfRob

146k

answered Nov 2 at 18:43

-1 votes

1 answer

95 views

What is the distance between Stephenson 2-18 and Earth?

James K

115k

modified Nov 4 at 22:22

1 vote

1 answer

91 views

sideways crescent moon but also no moon somewhere else?

James K

115k

answered Nov 7 at 18:16

Top Questions

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.