Astronomy Stack Exchange

3 votes

1 answer

197 views

When exactly was the last time that Earth's aphelion coincided (within 24 hours) with the northern winter (December) solstice?

PM 2Ring

9,379

modified 1 hour ago

1 vote

0 answers

18 views

The constellation you see when looking at Chicago from the space

observational-astronomy constellations

Elon

111

modified 2 hours ago

0 votes

1 answer

10 views

Do supernova remnant nebula re-collapse into a star?

supernova nebula stellar-remnants

PM 2Ring

9,379

answered 2 hours ago

2 votes

2 answers

100 views

Draco, Thuban and Northern Ecliptic Pole

ecliptic pole

CommunityBot

1

modified 6 hours ago

0 votes

0 answers

20 views

Time taken calculation to reach synodic degrees between planets

observational-astronomy orbit orbital-elements synodic-period

Mike G

16.5k

modified 8 hours ago

12 votes

2 answers

260 views

+50

What's the smallest scale at which dark matter has been measured?

observational-astronomy gravity dark-matter

Daddy Kropotkin

3,819

answered 12 hours ago

1 vote

1 answer

25 views

Units in distance parallax relation

parallax units

Greg Miller

1,139

answered 12 hours ago

0 votes

1 answer

28 views

Strange spectral types in star catalogs

star-catalogues spectral-type

planetmaker

11k

answered 16 hours ago

5 votes

2 answers

838 views

What does "by an amount" mean here?

astrophysics

Martin Kealey

101

modified 21 hours ago

2 votes

1 answer

314 views

Mass resolution

galaxy cosmology dark-matter n-body-simulations

pela

32.3k

modified 22 hours ago

2 votes

0 answers

20 views

Mass resolution in cosmological simulations

galaxy cosmology dark-matter mass n-body-simulations

schrodingal

21

asked yesterday

0 votes

0 answers

15 views

Where can I get a step by step guide to use CASA for obtaining a radio image of a planet like say Jupiter?

radio-astronomy jupiter radio-telescope

Dhruv Nayak

39

modified yesterday

1 vote

1 answer

45 views

Sky viewer from the moon

the-moon

planetmaker

11k

answered yesterday

3 votes

0 answers

83 views

CMBR: Is the cold spot a hint at the edge of the universe?

universe cosmic-microwave-background

uhoh

31.5k

modified 2 days ago

5 votes

1 answer

58 views

What kinds of stars have viable habitable zones other than G-type stars, and what would life be like orbiting them?

star planet habitable-zone dwarf-star

M. A. Golding

4,845

answered 2 days ago

14 votes

2 answers

240 views

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

night-sky galaxy-center

Vashu

202

answered 2 days ago

4 votes

1 answer

83 views

Stellar evolution temperature gradient - why the logarithm?

star stellar-evolution stellar-astrophysics

pela

32.3k

modified 2 days ago

2 votes

2 answers

98 views

What is stopping Event Horizon Telescope the size of the Earth’s orbit?

telescope space-telescope interferometry event-horizon-telescope

Rob

1,251

answered 2 days ago

1 vote

1 answer

24 views

Magnitude difference between companion in binary from mass difference in binaries

binary-star estimate

James K

88.7k

modified 2 days ago

-3 votes

0 answers

52 views

if the earth was the size of the sun how big would the moon be [closed]

the-sun the-moon earth hypothetical

TheRobloxGamer

311

modified Jun 29 at 5:05

0 votes

0 answers

30 views

How to get in touch with more societies and astronomy clubs around the world?

amateur-observing

Khawar Ali Sher

11

asked Jun 29 at 5:05

0 votes

1 answer

30 views

How to get coordinates and brightness of all stars from 1 constellation on SIMBAD?

coordinate data-analysis simbad

astrosnapper

7,170

answered Jun 28 at 19:18

8 votes

1 answer

824 views

Binoculars 10x50 in light polluted place

planet amateur-observing deep-sky-observing light-pollution binoculars

JayFor

126

answered Jun 28 at 18:47

5 votes

1 answer

193 views

Reason for different surface temperatures of Tau Ceti and Epsilon Indi at similar properties

star temperature spectral-type

Rob

1,251

answered Jun 28 at 12:47

0 votes

1 answer

28 views

Recognize the celestial object in UMa

observational-astronomy amateur-observing

planetmaker

11k

answered Jun 28 at 10:31

1 vote

1 answer

31 views

What can we learn from the rotation data of a star?

observational-astronomy star rotation

ProfRob

115k

answered Jun 28 at 7:15

2 votes

1 answer

49 views

How to use Astropy to edit a keyword (not value) in batches of FITS file headers to be used in AstroimageJ (AIJ)? (summer undergrad research project)

data-analysis python astropy fits-header

strange_octopi

21

modified Jun 28 at 5:58

3 votes

1 answer

39 views

+100

Evaluating Potentials using Galpy

galaxy python galactic-dynamics galactic-halo galactic-evolution

uhoh

31.5k

modified Jun 28 at 1:58

1 vote

1 answer

216 views

Query with Gaia: I have a list of 1000+ source_id's. How do I find the associated stars and their data?

data-analysis identify-this-object gaia raw-data

CommunityBot

1

modified Jun 27 at 20:02

2 votes

2 answers

56 views

What does "energy dumped into waves" mean?

astrophysics supermassive-black-hole

ProfRob

115k

answered Jun 27 at 16:30

2 votes

1 answer

58 views

What criteria determines whether stars are supernova type II candidates?

supernova gaia red-supergiant

ProfRob

115k

modified Jun 27 at 14:19

4 votes

1 answer

2k views

What does "to within less than about thirty Schwarzschild radii" mean?

black-hole astrophysics

ProfRob

115k

answered Jun 27 at 7:16

7 votes

3 answers

662 views

How can I calculate an orbital elliptic trajectory from the velocity vector?

orbit astrophysics

Willyam Carkey

89

modified Jun 26 at 21:35

10 votes

2 answers

1k views

JPL Horizons - "highly accurate measurements of planetary positions" - how do they do it?

positional-astronomy ephemeris

uhoh

31.5k

modified Jun 26 at 19:01

4 votes

1 answer

362 views

Virial theorem, contraction, and stars getting hotter

stellar-evolution hydrostatic-equilibrium

ProfRob

115k

answered Jun 26 at 18:19

2 votes

1 answer

59 views

Are asteroids 2012 PM35 and 2020 OG106 aliases?

asteroids conjunction

James K

88.7k

answered Jun 26 at 14:50

1 vote

0 answers

16 views

Can this ppxf fit work?

observational-astronomy galaxy python galactic-dynamics kinematics

trynerror

359

asked Jun 26 at 10:18

4 votes

1 answer

330 views

What does using these units (c=G=M=1) in MHD simulations mean?

accretion-discs units

ProfRob

115k

modified Jun 26 at 6:52

3 votes

0 answers

47 views

Are the human-made devices on Mars searching for existing life?

mars life

Joe Jobs

509

asked Jun 26 at 6:07

2 votes

0 answers

114 views

How the heck does JPL actually do the numerical integration for their development ephemerides? (general questions)

mathematics ephemeris nasa algorithm

uhoh

31.5k

asked Jun 25 at 23:54

4 votes

1 answer

113 views

About the strange case of Bonnor beams

general-relativity

stuffu

99

answered Jun 25 at 23:07

1 vote

1 answer

83 views

following several unknown phenomena detected at the edge of the solar system, is there a 5th force which acts at the edge of the solar system?

observational-astronomy astrophysics cosmology asteroids

James K

88.7k

answered Jun 25 at 11:11

2 votes

1 answer

48 views

Are there areas within Jupiter's magnetosphere without powerful radiation?

jupiter natural-satellites magnetic-field gas-giants radiation

Fred

1,446

modified Jun 25 at 7:29

1 vote

0 answers

61 views

Can virtual particles with zero energy and non-zero momentum contribute to dark energy?

expansion dark-energy

Felicia

467

modified Jun 25 at 6:42

4 votes

1 answer

106 views

How will the Solar tides affect the Earth's rotation once it is tidally locked to the Moon?

the-moon earth tidal-locking tidal-forces

Michael_1812

356

modified Jun 25 at 4:56

3 votes

1 answer

55 views

Best way to quantify the tidal stress on an exoplanet?

exoplanet tidal-forces

Michael_1812

356

answered Jun 25 at 2:38

0 votes

0 answers

14 views

Kinematical galaxy spectral analysis using ppxf?

observational-astronomy galaxy python kinematics elliptic

trynerror

359

modified Jun 24 at 14:37

1 vote

1 answer

141 views

Should we fear Wolf-Rayet WR-104?

supernova gamma-ray-bursts wolf-rayet

David Hammen

28.1k

answered Jun 24 at 14:05

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