Astronomy Stack Exchange

5 votes

0 answers

113 views

Reasons for extremely high number density of galaxies at low redshift

Starship

297

modified 1 hour ago

9 votes

1 answer

7k views

What is the ugriz magnitude system?

HDE 226868♦

37.3k

modified 1 hour ago

0 votes

0 answers

123 views

Easy curve modeling package for transits that fits the data, not just the parameters

HDE 226868♦

37.3k

modified 1 hour ago

0 votes

0 answers

20 views

Why is there a discrepancy between ecliptic longitudes found with Skyfield and Astrolog for old dates?

Outis Nemo

255

modified 3 hours ago

0 votes

0 answers

9 views

Does the sun's rotating core have a bulge in it like the Earth does at the equator and has this been measured?

DaveTheWave

129

modified 3 hours ago

-3 votes

1 answer

503 views

Inconsistency between Velocity vs Redshift and Scale Factor vs Time plots

Nicram Alatiws

1

modified 4 hours ago

11 votes

2 answers

2k views

Always orient a sundial towards polar north?

Ralf Kleberhoff

1,519

modified 5 hours ago

0 votes

1 answer

11 views

SNR (Signal to noise ratio) from image

ProfRob

156k

answered 5 hours ago

0 votes

0 answers

6 views

Using EAZY as photometric redshift estimation tool

Walker

51

asked 8 hours ago

-1 votes

0 answers

37 views

Is there any astronomical phenomenon such that its movement can be perceived in real time?

releseabe

141

modified 10 hours ago

1 vote

0 answers

25 views

Why is there a discrepancy between the difference in ecliptic longitudes as found with Skyfield when accounting or not accounting for precession?

Outis Nemo

255

modified yesterday

3 votes

0 answers

23 views

How did the Local Interstellar Cloud form?

jack_O'Dim

365

asked yesterday

0 votes

0 answers

14 views

Hour angle to Right Ascension correct when the longitude is positive

VansFannel

657

modified yesterday

4 votes

0 answers

91 views

Keyerror: 0 while using astropy SkyCoord

Starship

297

modified yesterday

1 vote

1 answer

93 views

Seeking Recommendations for Libraries or Software for Creating 2D/3D Physics Animations

Starship

297

modified yesterday

0 votes

1 answer

53 views

Resource suggestions?

Starship

297

modified yesterday

2 votes

1 answer

111 views

Need help in writing a query using ADQL (Astronomical Data Query Language)

Starship

297

modified yesterday

0 votes

0 answers

38 views

What would sunsets look like around different star types?

Rory 02

83

yesterday

30 votes

6 answers

11k views

The moon has just the right speed not to crash on the Earth or escape into space. What are the odds?

Zoltan

443

modified yesterday

10 votes

5 answers

9k views

During a total solar eclipse is it possible to see solar flares with the naked eye?

brainandforce

21

answered yesterday

4 votes

1 answer

89 views

Required temperature for a nova

Peter Erwin

17.3k

modified 2 days ago

9 votes

1 answer

977 views

How accurate is the "Equation of time" (mean time to actual solar time)? And how much can it vary from the average?

PM 2Ring

15k

modified 2 days ago

6 votes

0 answers

52 views

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

oaklight37

61

modified 2 days ago

2 votes

3 answers

51 views

Celestron X-Cel Barlow 2x magnification or Celestron X-Cel LX eyepiece 5 mm for 250P Dobsonian Sky-Watcher Telescope

Chappo Hasn't Forgotten

1,415

modified 2 days ago

1 vote

3 answers

108 views

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

benrg

3,914

answered 2 days ago

5 votes

1 answer

734 views

What does HJD-2450000 mean?

James K

126k

answered Jul 18 at 7:38

2 votes

0 answers

34 views

How to get the direction of the rotation axis of a celestial body using JPL Horizons?

Stellar Horizon

21

modified Jul 18 at 3:52

2 votes

0 answers

47 views

Do there exist open-source implementations of non-SGP4 propagators?

Michael Bonnet

566

asked Jul 17 at 15:47

3 votes

2 answers

121 views

Mathematical modeling of the influence of components of the interstellar medium on the distortion of the wavefront of the observed object

ayr

873

modified Jul 17 at 9:11

-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

12 votes

5 answers

6k views

What are the chances of finding an element in the outer solar system that otherwise can't be found on earth?

Oscar Lanzi

1,211

modified Jul 17 at 0:13

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

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

4 votes

2 answers

2k views

Can a star be made of sun spots?

DaveTheWave

129

modified Jul 16 at 16:32

1 vote

1 answer

109 views

How can I convert luminosity from [erg/s/Hz] to [erg/s]

gj283

36

answered Jul 16 at 14:26

-2 votes

0 answers

147 views

Universe age and cosmological time dilation throughout intergalactic space

Nicram Alatiws

1

modified Jul 16 at 12:20

1 vote

1 answer

110 views

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

LDM

11

answered Jul 16 at 10:17

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

1 vote

0 answers

35 views

How rare are nebulae which emit H-Beta/H-Gamma/H-Delta? (Balmer series)

jack_O'Dim

365

asked Jul 15 at 15:24

2 votes

1 answer

94 views

Transformation matrices and their derivation (if possible) for ICRS frame for reference to other frames

CommunityBot

1

modified Jul 15 at 13:03

3 votes

1 answer

88 views

Why does the blue loop occur?

Walter

5,659

answered Jul 15 at 8:29

2 votes

2 answers

177 views

Can we detect gravitational waves from galaxies merging?

James K

126k

modified Jul 15 at 7:11

10 votes

2 answers

3k views

Recurring flying object near the Big Dipper

Some one

1

modified Jul 15 at 6:21

2 votes

3 answers

9k views

Why does the moon appear on cloudy night sky?

Ronjon Handique

1

modified Jul 15 at 5:14

-1 votes

2 answers

128 views

What is _now_ on planet in another galaxy?

Miss_Understands

1,250

modified Jul 14 at 15:14

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