Hottest Questions This Month

28

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2

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6k

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Is the science in "Don't Look Up" realistic?

modified Dec 29 '21 at 17:14 Dave Meteors 1

22

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2

answers

3k

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What ground-based observational evidence is there that the Moon doesn't have an atmosphere?

modified yesterday M. A. Golding 3,951

5

votes

3

answers

1k

views

What does it mean for a proto-neutron star to be opaque to neutrinos?

neutron-star

answered Jan 12 at 10:59 pela 29.7k

17

votes

4

answers

1k

views

Can a planet with no atmosphere be orbited at extremely low altitudes?

orbit orbital-mechanics planetary-atmosphere velocity

answered 1 hour ago astrho 1

8

votes

3

answers

2k

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Is possible to identify the Lagrange L2 point in the sky from the earth?

lagrange-point

modified Dec 31 '21 at 8:00 PM 2Ring 7,181

11

votes

2

answers

2k

views

14,000 square degrees

mathematics terminology sky-survey

modified 2 days ago HDE 226868♦ 33.1k

10

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3

answers

2k

views

Why does a timelapse video of a stationary Milky Way make the horizon appear to move from horizontal to vertical?

milky-way rotation

answered Dec 25 '21 at 18:36 Lee Mosher 141

6

votes

3

answers

1k

views

Trouble Seeing Distant Planets Such as Jupiter and Uranus

telescope

modified Jan 9 at 6:49 Glorfindel 4,250

6

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1

answer

1k

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Why was the Cosmic Microwave Background (CMB) released at a blackbody temperature of 3000K rather than 30,000K?

observational-astronomy cosmology big-bang-theory cosmic-microwave-background

modified Dec 26 '21 at 15:18 ProfRob 107k

7

votes

2

answers

934

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Which JWST instrument modes are compatible with observations of the bright trans-Earth planets Mars, Jupiter, and Saturn? Which aren't?

observational-astronomy space-telescope planetary-science instruments james-webb-space-telescope

answered Jan 11 at 20:14 giardia 849

8

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2

answers

708

views

At what point are orbital resonances no longer "ordered" but "chaotic?"

orbit mathematics terminology orbital-resonance

answered Jan 5 at 19:28 Connor Garcia♦ 11.6k

7

votes

2

answers

1k

views

Will 3,600ft asteroid be visible at my location tonight?

observational-astronomy amateur-observing asteroids

answered yesterday Mike G 16.4k

5

votes

1

answer

648

views

How long would it take to realize there are "star-like objects" (i.e. planets) that change position in respect to the "fixed stars"?

observational-astronomy orbit planet history

modified Dec 30 '21 at 3:26 PM 2Ring 7,181

3

votes

2

answers

721

views

Will these simple 2 convex lens arrangement telescope see the moon clearly?

telescope

modified Dec 28 '21 at 22:38 uhoh 31.1k

10

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1

answer

581

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Artificial radio waves masked by a star's natural radio waves?

radio-astronomy seti

modified Dec 28 '21 at 21:28 ProfRob 107k

7

votes

1

answer

392

views

Define stellar metallicity

metallicity

modified Jan 1 at 17:52 Carl 183

4

votes

2

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319

views

Tips of Crescent

the-moon positional-astronomy

modified Jan 2 at 4:49 Bob Jarvis - Reinstate Monica 103

6

votes

2

answers

196

views

Identifying Constellations from Sky Maps

observational-astronomy amateur-observing constellations

modified Jan 2 at 0:11 James K 81.6k

6

votes

1

answer

443

views

When is JWST's first light?

james-webb-space-telescope first-light

answered Jan 12 at 13:23 pela 29.7k

5

votes

2

answers

146

views

Question: By design, JWST cannot observe in the anti-sun direction. Is this due to Gegenschein backscatter?

infrared james-webb-space-telescope

modified Jan 16 at 22:18 John McCarthy 141

4

votes

1

answer

273

views

Rising and setting time of planets in relation to the sun

observational-astronomy the-sun positional-astronomy

modified Jan 2 at 23:41 planetmaker 9,574

5

votes

2

answers

104

views

Does precession flip the seasons?

precession

answered Jan 10 at 17:52 David Hammen 25.5k

3

votes

1

answer

162

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Density of Plasma in Solar Corona

the-sun stellar-astrophysics solar-wind plasma-physics corona

modified Jan 6 at 14:46 Thomas 1,460

3

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4

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153

views

Sunset and sunrise formulas adopted by IAU

the-sun algorithm

answered Jan 2 at 5:05 stretch 1,058

6

votes

2

answers

103

views

Will the James Webb Space Telescope need re-alignment of primary mirror segments?

telescope space-telescope james-webb-space-telescope

modified Jan 5 at 17:23 T W 1

6

votes

2

answers

121

views

What is the maximum latitude from which a satellite in a geostationary orbit around Saturn would be visible to an observer on the planet?

orbit orbital-mechanics coordinate saturn

modified Jan 5 at 13:35 giardia 849

4

votes

1

answer

209

views

How clear will the images taken by the JWST be, compared to the rest of the telescopes?

james-webb-space-telescope

modified Jan 1 at 23:38 Peter Mortensen 221

2

votes

1

answer

120

views

Calculate eccentric anomaly using Kepler's equation

kepler keplers-laws

modified Dec 31 '21 at 15:55 James K 81.6k

9

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3

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153

views

Why is the composition of the sun so distinct from that of earth?

the-sun solar-system earth star-formation planetary-formation

answered Jan 15 at 9:46 ProfRob 107k

4

votes

1

answer

116

views

vertical shift is equals to half of angular dimension plus parallax plus atmosphere refraction

parallax

answered Dec 23 '21 at 18:42 JohnHoltz 6,857

5

votes

1

answer

140

views

What's the difference between the Roche lobe and Roche sphere?

orbit gravity astrophysics orbital-mechanics

answered Dec 24 '21 at 11:21 Daddy Kropotkin 3,569

2

votes

1

answer

104

views

What is that stuff around Andromeda Galaxy

galaxy distances

modified Jan 11 at 18:03 Calc-You-Later 1,413

2

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2

answers

157

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Incorrect Mars orbital time while calculating using Kepler formula in Java

orbit astrophysics software

answered Jan 3 at 0:04 uhoh 31.1k

2

votes

1

answer

120

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How can I reconcile the JWST journey time of thirty days to Lagrange L2 with simple orbital mechanics?

orbital-mechanics

modified Jan 5 at 21:13 Zac67 166

4

votes

2

answers

154

views

Probability of transit of an exoplanet in front of its star

exoplanet mathematics planetary-transits planetary-science

modified yesterday Ng Ph 298

3

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1

answer

114

views

Is it still called an orbital resonance if the ratio is irrational?

orbit mathematics terminology orbital-resonance

answered Jan 6 at 21:08 zephyr 13.7k

-1

votes

1

answer

128

views

Why are there 12 zodiac signs?

history constellations zodiac

answered Dec 25 '21 at 8:03 James K 81.6k

3

votes

2

answers

99

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How can it be justified that every discovery at z > 1 is an indication of "slowing down" or past deceleration?

cosmology dark-energy

modified 21 hours ago pela 29.7k

3

votes

1

answer

116

views

How did the mountain range form in Galle crater?

geology crater

answered Dec 31 '21 at 10:55 James K 81.6k

2

votes

2

answers

113

views

How can the JWST telescope detect matter “shortly” after the big bang?

observable-universe

answered Jan 8 at 0:41 benrg 2,007

4

votes

1

answer

110

views

Scaling Relations

mathematics keplers-laws

modified Dec 26 '21 at 3:11 uhoh 31.1k

1

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2

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47

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How much magnification would I get by this Dall-Kirkham telescope?

telescope

answered Jan 11 at 18:02 JohnHoltz 6,857

2

votes

1

answer

96

views

Sun Moon earth Angle

observational-astronomy the-moon mathematics

modified Dec 27 '21 at 8:33 James K 81.6k

7

votes

1

answer

95

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Would anything be different on Earth if the rotation of the Moon wasn't synchronous?

the-moon

modified Dec 23 '21 at 17:29 Connor Garcia♦ 11.6k

2

votes

1

answer

121

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What is the apparent magnitude of the Milky Way from the viewpoint of the Large Magellanic Cloud?

milky-way apparent-magnitude magellanic-cloud

answered Jan 16 at 9:19 James K 81.6k

3

votes

2

answers

68

views

How to compute a Flux through a filter using SYNPHOT in Python

amateur-observing photography python apparent-magnitude

answered Dec 31 '21 at 8:32 Adrian 68

4

votes

1

answer

68

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Examples of the oldest "precoveries"; objects that were first discovered in recent data but then looking back are confirmed in much older data

observational-astronomy history data-analysis raw-data

modified Jan 12 at 10:01 uhoh 31.1k

1

vote

1

answer

109

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If we put a radio telescope on Mars and use it in array with earth radio telescopes, how much will we able to see?

radio-astronomy radio-telescope interferometry

answered Jan 14 at 3:36 Christopher James Huff 516

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