User Bob516

13

votes

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502

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At Mars' equator how long does twilight last?

mars twilight

Dec 20 at 14:47 Community♦ 1

8

votes

1

answer

1k

views

Why is Ganymede's aurora only visible in ultraviolet while Earth's is bright green and red?

hubble-telescope aurora electromagnetic-spectrum

Jan 14 at 19:14 Carl Witthoft 2,579

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7

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answer

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Are any bow shocks seen in the visible spectrum?

bow-shock visible-light

Jul 24 '19 at 21:45 Bob516 1,433

6

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answer

110

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Is the gravitational field of the sun uniform?

the-sun gravity orbital-mechanics parker-solar-probe

Jul 4 at 21:28 David Hammen 17.8k

6

votes

2

answers

219

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Are meteors visible on Mars?

mars meteor naked-eye

Dec 18 at 23:46 Keith McClary 1,086

6

votes

2

answers

134

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When do radio and tv signals become indistinguishable from background noise of the universe?

radio-astronomy cosmic-microwave-background

Nov 16 at 10:47 Anders Sandberg 5,051

5

votes

1

answer

204

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Is the nose of the solar system and the solar apex the same thing?

solar-system

Jan 25 '19 at 1:53 Community♦ 1

4

votes

1

answer

136

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Uranus' axis of rotation-when discovered?

rotation history uranus

Jul 30 '19 at 3:14 Mike G 11.7k

4

votes

1

answer

119

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What does the Sun look like from the heliopause?

the-sun angular-diameter

Apr 14 '19 at 14:29 Wayfaring Stranger 3,471

4

votes

1

answer

119

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Would one have to be more than halfway to the Oort Cloud for the Sun to appear as bright as the full moon?

the-sun the-moon apparent-magnitude

Jan 3 '19 at 8:32 James K 54.7k

4

votes

0

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34

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How much is usually deposited in a Mars regional dust storm?

mars dust-storm

Dec 16 '18 at 3:39 Bob516 1,433

3

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50

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Closest stable orbit about the sun of an asteroid?

the-sun asteroids orbital-mechanics

Jul 20 at 22:55 James K 54.7k

3

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2

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53

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Solar flares/CME dangers to life?

earth solar-flare coronal-mass-ejection danger

Jul 11 at 21:25 Bob516 1,433

3

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answer

59

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Orientation of local star map

milky-way ecliptic star-maps

Jun 24 at 19:47 Dr Chuck 3,478

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98

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Are Sun-Earth L1 & L2 points generally considered outside the Earth's Hill Sphere?

the-sun earth lagrange-point hill-sphere

Feb 19 at 17:30 Calc-You-Later 655

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What is the surface feature of the mesas in the Noctis Labyrinthus on Mars?

mars surface

Jan 29 at 22:59 Adrian R 280

3

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37

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Would Martian sunrise/sunset look the same at the Thaumasia Plateau as the rovers' photographs?

mars naked-eye sunrise

Dec 18 at 19:21 Bob516 1,433

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3

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Is there a reason two interstellar objects were found in the solar system in such a short period of time?

observational-astronomy oumuamua

Dec 8 at 5:48 JohnRobyClayton 351

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0

answers

67

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What is the apparent magnitude of the faintest stars visible during a full moon?

the-moon apparent-magnitude naked-eye

Sep 26 '19 at 12:23 Bob516 1,433

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0

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119

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Trans-Neptunian Dwarf Planet near Heliopause

dwarf-planets trans-neptunian-object

Jun 3 '19 at 5:40 antispinwards 10.1k

3

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490

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Word for blue ring around the Earth

earth terminology

May 23 '19 at 13:57 uhoh 21.9k

2

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0

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20

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Density of a sunspot compared to the surrounding photosphere?

density sunspots photosphere

Jul 21 at 23:19 Bob516 1,433

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How can I find the depth of a portion of the Valles Marineris?

mars topographic-map

Feb 12 at 18:25 antlersoft 1,641

2

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1

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77

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Seeing a star near zenith around sunset

amateur-observing naked-eye sunset

Oct 14 '19 at 8:38 uhoh 21.9k

2

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1

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164

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Could Ganymede's aurora be seen with the naked eye?

hubble-telescope naked-eye aurora

May 14 '19 at 15:51 Bob516 1,433

2

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2

answers

114

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Would the solar corona be visible from the distance of the outer planets?

the-sun naked-eye corona outer-solar-system

Jan 6 '19 at 15:22 Alchimista 754

2

votes

2

answers

70

views

How far above the Earth's surface does interplanetary space begin?

solar-system definition interplanetary-medium

Jan 1 '19 at 6:48 uhoh 21.9k

1

vote

1

answer

59

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Which solar system objects have the least stable solar orbits?

orbit asteroids near-earth-object trojan-asteroids centaur

Jul 4 at 5:32 PM 2Ring 3,597

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vote

1

answer

54

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Why are only some of the geologic features in Mars' Noctis Labyrinthus region named?

mars iau nomenclature

Mar 21 at 17:09 Stuart Robbins 774

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vote

1

answer

63

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How often are there five planet apparently aligned within 25°?

planet alignment

Feb 22 at 23:12 James K 54.7k

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41 Questions

At Mars' equator how long does twilight last?

Why is Ganymede's aurora only visible in ultraviolet while Earth's is bright green and red?

Are any bow shocks seen in the visible spectrum?

Is the gravitational field of the sun uniform?

Are meteors visible on Mars?

When do radio and tv signals become indistinguishable from background noise of the universe?

Is the nose of the solar system and the solar apex the same thing?

Uranus' axis of rotation-when discovered?

What does the Sun look like from the heliopause?

Would one have to be more than halfway to the Oort Cloud for the Sun to appear as bright as the full moon?

How much is usually deposited in a Mars regional dust storm?

Closest stable orbit about the sun of an asteroid?

Solar flares/CME dangers to life?

Orientation of local star map

Are Sun-Earth L1 & L2 points generally considered outside the Earth's Hill Sphere?

What is the surface feature of the mesas in the Noctis Labyrinthus on Mars?

Would Martian sunrise/sunset look the same at the Thaumasia Plateau as the rovers' photographs?

Is there a reason two interstellar objects were found in the solar system in such a short period of time?

What is the apparent magnitude of the faintest stars visible during a full moon?

Trans-Neptunian Dwarf Planet near Heliopause

Word for blue ring around the Earth

Density of a sunspot compared to the surrounding photosphere?

How can I find the depth of a portion of the Valles Marineris?

Seeing a star near zenith around sunset

Could Ganymede's aurora be seen with the naked eye?

Would the solar corona be visible from the distance of the outer planets?

How far above the Earth's surface does interplanetary space begin?

Which solar system objects have the least stable solar orbits?

Why are only some of the geologic features in Mars' Noctis Labyrinthus region named?

How often are there five planet apparently aligned within 25°?