Hottest Questions Today

0 votes

0 answers

16 views

Why are what end up being meteorites not in stable orbit as planets and large asteroids are?

releseabe

101

asked 3 hours ago

0 votes

1 answer

65 views

Why not building a swarm of space-telescopes?

telescope space angular-resolution james-webb-space-telescope

James K

87.6k

answered 21 hours ago

-1 votes

0 answers

23 views

I try to do a record today, into a video game called no men's sky, it's a space simulation. how old would I be after 100000 light years in 1h? [closed]

light age

Jenz Jenzen

1

asked 16 hours ago

10 votes

2 answers

973 views

Why haven’t we observed supernova events of the hypothetical population III stars?

star supernova

GrapefruitIsAwesome

1,680

modified 2 days ago

5 votes

1 answer

76 views

Do “neutrino supernovae” exist?

astrophysics supernova neutron-star white-dwarf

ProfRob

114k

modified yesterday

5 votes

1 answer

46 views

+100

What does it mean for something to be optically thick to pair production?

binary-star gamma-ray-bursts high-energy-astrophysics

ProfRob

114k

answered 10 hours ago

2 votes

0 answers

43 views

What would be the noticeable effects (if any) if the Earth's orbit entered a chaotic trajectory?

life chaos three-body-problem binary-single-interactions

Justin T

1,997

asked yesterday

12 votes

1 answer

1k views

Is the scaling in this composite photo of the moon and the Andromeda galaxy reasonably correct?

observational-astronomy

blahdiblah

103

modified 2 days ago

22 votes

4 answers

5k views

Are there exoplanets as large as the star they orbit?

exoplanet

Fred

1,446

modified May 18 at 4:39

1 vote

1 answer

61 views

Are there tidally locked bodies where the "far side" is denser?

tidal-forces tidal-locking

kotoole

111

modified yesterday

0 votes

0 answers

35 views

What are flux letters mean ? (U, B, V, R, I, G, J, H, K, u, g, r, i, z)

flux simbad

MiscellaneousUser

1,157

asked yesterday

2 votes

0 answers

27 views

How do neutron stars maintain inhomogeneous surfaces and migrating "hot spots"? (e.g. SGR 1830-0645)

neutron-star magnetic-field x-ray magnetar nicer

uhoh

31.6k

modified yesterday

5 votes

2 answers

276 views

How could I see Andromeda as large as in this picture?

observational-astronomy galaxy amateur-observing

ProfRob

114k

modified yesterday

4 votes

2 answers

159 views

How to find the resolution of a spectrum?

spectroscopy spectra

Thomas

2,314

modified yesterday

0 votes

0 answers

19 views

Is it coincidence that the change in GPE when falling from deep space into the largest know neutron star is approximately mc squared Joules?

gravity neutron-star potential-energy

Alan Gee

191

asked 2 days ago

0 votes

1 answer

84 views

Celestial Coordinates and Sun's degrees below horizon

the-sun coordinate celestial-mechanics

stretch

1,258

modified 2 days ago

1 vote

1 answer

51 views

How do we measure the current positions of galaxies?

galaxy distances

Kavin Ishwaran

2,436

answered May 19 at 11:11

0 votes

0 answers

26 views

When will be the next visible Supernova? [duplicate]

supernova

d_e

1,248

asked 2 days ago

2 votes

1 answer

15 views

Where can I find data on SDSS filter profiles?

telescope photometry

astrosnapper

7,135

answered 2 days ago

1 vote

0 answers

18 views

Does cosmic inflation spawn from empty space, or vice versa?

big-bang-theory cosmological-inflation

DPhillips

29

asked 2 days ago

10 votes

2 answers

865 views

Why is the ring in this simulation of Sgr A* off center?

black-hole general-relativity supermassive-black-hole event-horizon-telescope

Bhibuthi bhusan Patel

1

modified May 15 at 11:17

15 votes

3 answers

6k views

What is the actual average distance of the Moon from Earth?

orbit the-moon orbital-mechanics

PM 2Ring

8,862

modified May 5 at 20:28

5 votes

1 answer

50 views

What is the spectral reflection curve of cold white dwarfs and neutron stars?

neutron-star optics white-dwarf

Anders Sandberg

10.2k

answered May 19 at 13:06

3 votes

1 answer

56 views

When were Swift and Voltaire discovered?

mars crater deimos

Glorfindel

4,300

modified May 17 at 14:46

7 votes

1 answer

319 views

Is this image of Sgr A* correctly labelled?

event-horizon-telescope sagittarius-a

ProfRob

114k

modified May 15 at 9:20

-1 votes

0 answers

20 views

If two object moving away from each other, does one object see the other slower than their relative speed? [migrated]

general-relativity velocity apparent-motion

Aung Satt

107

asked May 18 at 17:17

3 votes

0 answers

70 views

Does the presence of dark matter in the Milky Way significantly distort our parallax based measurements of distance?

general-relativity dark-matter parallax

MarkVonTexas

305

asked May 17 at 6:17

8 votes

1 answer

219 views

Is the appearance of accretion disks of M87 and Sgr A* in EHT image, related to the nucleus being active or non-active?

supermassive-black-hole active-galaxy sagittarius-a

ProfRob

114k

modified May 14 at 16:48

1 vote

1 answer

72 views

How far above the galactic plane would a telescope array need to be in order to image the whole galaxy?

galaxy photography space-telescope

Victor Stafusa

952

modified May 15 at 14:26

1 vote

2 answers

71 views

What object(s) are furthest above/below the galactic plane?

galaxy galactic-dynamics galaxy-center extinction galactic-halo

Peter Erwin

14.7k

answered May 15 at 9:49

3 votes

0 answers

52 views

How are plage regions related to the density of medium and velocity FeII ions?

star observational-astronomy the-sun data-analysis spectra

uhoh

31.6k

modified May 17 at 7:21

1 vote

1 answer

72 views

What is the "sunrise equation" for non-constant declination component?

declination sunrise

uhoh

31.6k

answered May 15 at 23:55

0 votes

1 answer

63 views

What is the nearest synchronous twin star system? [closed]

binary-star

Connor Garcia♦

13.6k

answered May 16 at 17:20

1 vote

2 answers

129 views

Why do sunrise/sunset times (for a given location) vary based on the source of the data?

weather sunrise sunset

James K

87.6k

answered May 15 at 13:32

7 votes

1 answer

314 views

Should I drop source shot noise from the SNR calculation when all I care about is detection (not photometric precision)?

photometry resource-request detectors

ProfRob

114k

modified May 12 at 15:11

0 votes

1 answer

56 views

Are Right Ascension and Declination from an "inside" perspective?

star-maps

James K

87.6k

answered May 15 at 15:28

3 votes

1 answer

85 views

Does the newly found orientation of Sgr A* match the theory that the Fermi bubbles might have been caused by jets?

event-horizon-telescope sagittarius-a

samcarter_is_at_topanswers.xyz

546

answered May 16 at 13:54

10 votes

0 answers

86 views

How bright would the night sky be in the galactic center?

night-sky galaxy-center

Filip Milovanović

201

asked May 14 at 19:26

0 votes

1 answer

44 views

Calculate how many days left for synodic period from particular planet

observational-astronomy orbit orbital-elements synodic-period

James K

87.6k

answered May 14 at 7:08

9 votes

2 answers

3k views

Why aren't reflector telescopes built with an offset secondary mirror?

telescope

psmears

109

modified May 3 at 18:08

2 votes

1 answer

74 views

Will Jupiter's days speed up?

jupiter space speed

Anders Sandberg

10.2k

answered May 13 at 9:29

1 vote

1 answer

27 views

SAO Encyclopedia of Astronomy information

astrophysics

James K

87.6k

answered May 15 at 5:21

5 votes

6 answers

222 views

Interpretation of Hubble constant in SI units

cosmology universe hubble-constant

BowlOfRed

1,405

answered May 6 at 22:26

9 votes

3 answers

1k views

How time-symmetric is orbital mechanics?

orbit orbital-mechanics

zephyr

14.4k

answered Apr 29 at 14:46

5 votes

1 answer

192 views

Difference between NSBH and BHNS mergers

black-hole neutron-star binary-star star-formation merger

ProfRob

114k

answered May 8 at 11:03

14 votes

2 answers

1k views

What determines the speed of a star's solar wind?

solar-wind

ProfRob

114k

answered May 2 at 18:47

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