Hottest Questions This Week

10 votes

2 answers

1k views

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

positional-astronomy ephemeris

uhoh

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modified Jun 26 at 19:01

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

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

2 answers

838 views

What does "by an amount" mean here?

astrophysics

Martin Kealey

101

modified 20 hours ago

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

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

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

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

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

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

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

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

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

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

1 answer

45 views

Sky viewer from the moon

the-moon

planetmaker

11k

answered yesterday

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

-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 2 days ago

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

2 answers

56 views

What does "energy dumped into waves" mean?

astrophysics supermassive-black-hole

ProfRob

115k

answered Jun 27 at 16:30

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

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

0 votes

1 answer

28 views

Recognize the celestial object in UMa

observational-astronomy amateur-observing

planetmaker

11k

answered Jun 28 at 10:31

0 votes

1 answer

28 views

Strange spectral types in star catalogs

star-catalogues spectral-type

planetmaker

11k

answered 16 hours ago

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 2 days ago

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

1 vote

1 answer

24 views

Units in distance parallax relation

parallax units

Greg Miller

1,139

answered 12 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

2 votes

0 answers

20 views

Mass resolution in cosmological simulations

galaxy cosmology dark-matter mass n-body-simulations

schrodingal

21

asked yesterday

1 vote

0 answers

17 views

The constellation you see when looking at Chicago from the space

observational-astronomy constellations

Elon

111

modified 1 hour ago

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

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

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Top Questions

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

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

Binoculars 10x50 in light polluted place

What does "by an amount" mean here?

Virial theorem, contraction, and stars getting hotter

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

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?

Stellar evolution temperature gradient - why the logarithm?

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

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

What criteria determines whether stars are supernova type II candidates?

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

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

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)

Are asteroids 2012 PM35 and 2020 OG106 aliases?

Sky viewer from the moon

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

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

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

What does "energy dumped into waves" mean?

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

Magnitude difference between companion in binary from mass difference in binaries

Recognize the celestial object in UMa

Strange spectral types in star catalogs

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

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

Units in distance parallax relation

Time taken calculation to reach synodic degrees between planets

Mass resolution in cosmological simulations

The constellation you see when looking at Chicago from the space

Can this ppxf fit work?

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

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