User ahiijny

14

votes

4

answers

2k

views

M87 Black hole. Why can we see the blackness?

black-hole

Oct 16 at 6:59 ProfRob 103k

14

votes

4

answers

6k

views

Will there be collision between universes?

universe

Oct 4 at 17:05 JDługosz 877

78

votes

2

answers

14k

views

Could the dinosaurs have seen the asteroid that killed them?

asteroids history comets naked-eye chicxulub

Jul 12 at 16:41 ProfRob 103k

47

votes

3

answers

12k

views

If Earth is tilted, why is Polaris always above the same spot?

observational-astronomy earth amateur-observing

May 29 at 22:42 Mike G 16.3k

6

votes

1

answer

473

views

Superscript-subscript uncertainty notation

astrophysics magnitude notation

May 6 at 17:24 Luis Molina-Tanco Univ Malaga 1

29

votes

5

answers

8k

views

Is it possible to mount a telescope on a plane? Is it beneficial?

telescope sofia

Feb 12 at 10:18 B--rian 5,059

3

votes

1

answer

143

views

Validity of ephemeris time

time

Jan 28 at 16:49 PM 2Ring 5,838

33

votes

3

answers

5k

views

Can Pluto be seen with the naked eye from Neptune when Pluto and Neptune are closest?

observational-astronomy pluto naked-eye neptune

Jan 19 at 13:37 ProfRob 103k

9

votes

1

answer

154

views

Is there any difference between M87's image and predictions?

black-hole

Dec 30 at 19:40 B--rian 5,059

10

votes

5

answers

2k

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Where to obtain Tycho Brahe's data?

mars history resource-request

Dec 20 at 20:46 Benno 121

10

votes

1

answer

5k

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What is the origin of the OBAFGKM classification system?

star classification

Dec 15 at 0:10 James K 77.5k

9

votes

1

answer

175

views

What is the farthest reported distance from observer from which a solar system body has occulted a star?

observational-astronomy kuiper-belt occultation

Nov 13 '20 at 5:28 uhoh 30.6k

25

votes

7

answers

10k

views

If the Moon were impacted by a suitably sized meteor, how long would it take to impact the Earth?

orbit the-moon

Oct 27 '20 at 20:19 Connor Garcia♦ 10.7k

12

votes

1

answer

17k

views

How does the Moon look like from different latitudes of the Earth?

Oct 16 '20 at 22:34 Moon phase explorer 1

35

votes

3

answers

3k

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Do moons have moons?

natural-satellites

May 7 '20 at 4:22 ahiijny 421

16

votes

3

answers

5k

views

In which direction is the sun travelling?

the-sun

Mar 28 '20 at 5:04 msb 215

25

votes

1

answer

5k

views

What's the reason that we have a different number of days each month?

history time terminology

Feb 29 '20 at 0:13 user31969 1

7

votes

2

answers

268

views

Why not us interferometry to take a picture of Pluto?

planet telescope interferometry

Feb 23 '20 at 12:33 ProfRob 103k

17

votes

4

answers

5k

views

Official degrees of earth’s rotation per day

earth rotation

Nov 8 '19 at 22:00 Larry Thomas Jones 11

9

votes

3

answers

2k

views

How is time defined in astronomy?

space-time time

Nov 6 '19 at 8:49 John Rennie 1,529

46

votes

3

answers

11k

views

Why is Mars cold?

mars temperature surface

Oct 10 '19 at 10:52 pela 28.7k

21

votes

4

answers

8k

views

Would an object shot from earth fall into the sun?

the-sun orbital-mechanics

Sep 24 '19 at 13:40 TheGreatCabbage 506

18

votes

4

answers

3k

views

Are there any to-scale diagrams of the TRAPPIST-1 system?

trappist-1

Aug 30 '19 at 8:20 Jan van Oort 101

11

votes

2

answers

3k

views

On the consistency of different well-polished astronomy software

constellations software

Aug 5 '19 at 6:51 Mike G 16.3k

10

votes

3

answers

4k

views

How well would the Moon protect the Earth from an Asteroid?

the-moon earth asteroids impact rogue-planet

Jul 30 '19 at 22:46 Muze 1

6

votes

2

answers

472

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Is there a way to factor age into the mass-luminosity relationship for stars?

star

Jul 25 '19 at 0:00 uhoh 30.6k

19

votes

2

answers

3k

views

Why does the Earth have a z-component at the start of the J2000 epoch?

orbit nasa ephemeris

Jul 15 '19 at 15:55 amateurAstro 1,240

25

votes

4

answers

4k

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Are there any double stars that I can actually see orbit each other?

observational-astronomy amateur-observing binary-star

Jul 14 '19 at 14:47 CommunityBot 1

18

votes

1

answer

2k

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Why can't supermassive black holes merge? (or can they?)

black-hole gravity supermassive-black-hole gravitational-waves

Jul 12 '19 at 23:56 CommunityBot 1

3

votes

0

answers

80

views

Is TDB monotonic? Does it or any of its derivatives have yearly discontinuities with respect to an atomic clock?

fundamental-astronomy general-relativity time

Jul 9 '19 at 20:12 Mike G 16.3k

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M87 Black hole. Why can we see the blackness?

Will there be collision between universes?

Could the dinosaurs have seen the asteroid that killed them?

If Earth is tilted, why is Polaris always above the same spot?

Superscript-subscript uncertainty notation

Is it possible to mount a telescope on a plane? Is it beneficial?

Validity of ephemeris time

Can Pluto be seen with the naked eye from Neptune when Pluto and Neptune are closest?

Is there any difference between M87's image and predictions?

Where to obtain Tycho Brahe's data?

What is the origin of the OBAFGKM classification system?

What is the farthest reported distance from observer from which a solar system body has occulted a star?

If the Moon were impacted by a suitably sized meteor, how long would it take to impact the Earth?

How does the Moon look like from different latitudes of the Earth?

Do moons have moons?

In which direction is the sun travelling?

What's the reason that we have a different number of days each month?

Why not us interferometry to take a picture of Pluto?

Official degrees of earth’s rotation per day

How is time defined in astronomy?

Why is Mars cold?

Would an object shot from earth fall into the sun?

Are there any to-scale diagrams of the TRAPPIST-1 system?

On the consistency of different well-polished astronomy software

How well would the Moon protect the Earth from an Asteroid?

Is there a way to factor age into the mass-luminosity relationship for stars?

Why does the Earth have a z-component at the start of the J2000 epoch?

Are there any double stars that I can actually see orbit each other?

Why can't supermassive black holes merge? (or can they?)

Is TDB monotonic? Does it or any of its derivatives have yearly discontinuities with respect to an atomic clock?