User christopherlovell - Astronomy Stack Exchange

88 votes

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Why does Io cast a hard shadow on Jupiter, but the Moon casts a soft shadow on Earth?

answered May 22, 2020 at 12:58

46 votes

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Are new stars less pure as generations go by?

answered Jan 22, 2021 at 11:54

13 votes

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Is there a name for a planet and its moons/satellites?

answered Sep 21, 2020 at 14:30

13 votes

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Average amount of annual daylight at any place on earth

answered Jun 7, 2014 at 14:53

10 votes

Is the Earth going to evolve towards Mars' fate or Venus' fate?

answered Feb 2, 2016 at 13:31

9 votes

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Why do pictures of the Milky Way look like a spiral?

answered May 23, 2014 at 13:46

7 votes

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Is the Sun homogeneous?

answered Jun 3, 2014 at 21:54

7 votes

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What fraction of galaxies in the observable universe have we actually observed?

answered Jan 30, 2017 at 8:58

6 votes

Inclination in Kepler's laws

answered Jan 25, 2016 at 19:01

6 votes

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Recommendation for introductory cosmology text

answered Jun 7, 2014 at 15:22

6 votes

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The reason behind Big Bang

answered Mar 2, 2014 at 22:23

5 votes

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Are stars rotating?

answered Feb 28, 2014 at 13:45

5 votes

Open problems in astronomy that an amateur (with a PhD in some other field) would have a chance of solving?

answered Apr 13, 2015 at 17:08

5 votes

Can dark matter decrease the Jeans length?

answered Feb 19, 2016 at 8:36

5 votes

How much mass do the volcanoes of Io erupt past escape velocity?

answered Oct 8, 2016 at 19:30

4 votes

Redshift quantization

answered Dec 19, 2016 at 15:07

4 votes

What shape are black holes theorized to be?

answered May 1, 2014 at 18:10

3 votes

How close are we to having the technology to measure planetary obliquity for exoplanets?

answered Jan 8, 2017 at 16:04

3 votes

Is there a single, most prominent helium line?

answered Jan 13, 2016 at 9:48

2 votes

Good textbooks for a descriptive astronomy course

answered Feb 2, 2016 at 15:09

2 votes

How exactly does inflation convert random gravity fluctuations into coherent gravitational waves?

answered May 26, 2014 at 20:29

2 votes

Why do we not send diggers to Mars if we think there's underground water?

answered Jun 1, 2014 at 22:23

2 votes

Convert orbital elements to positions and velocities

answered Mar 3, 2014 at 9:45

2 votes

Is there anything special about our position in the galaxy thats necessary for life?

answered Feb 3, 2014 at 10:41

2 votes

Why do we think that there is no two-solar-mass black hole?

answered Jun 6, 2014 at 12:30

2 votes

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Dating very old objects/events

answered Dec 26, 2015 at 14:21

2 votes

Why doesn't Jupiter increase the chances of an asteroid to strike the Earth?

answered Dec 31, 2015 at 16:05

1 vote

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Cosmological deflation?

answered May 11, 2015 at 18:47

1 vote

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How are rogue planets discovered?

answered Feb 13, 2014 at 11:04

0 votes

What is the speed of light relative to (in space)?

answered Feb 28, 2014 at 11:19

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31 Answers

Why does Io cast a hard shadow on Jupiter, but the Moon casts a soft shadow on Earth?

Are new stars less pure as generations go by?

Is there a name for a planet and its moons/satellites?

Average amount of annual daylight at any place on earth

Is the Earth going to evolve towards Mars' fate or Venus' fate?

Why do pictures of the Milky Way look like a spiral?

Is the Sun homogeneous?

What fraction of galaxies in the observable universe have we actually observed?

Inclination in Kepler's laws

Recommendation for introductory cosmology text

The reason behind Big Bang

Are stars rotating?

Open problems in astronomy that an amateur (with a PhD in some other field) would have a chance of solving?

Can dark matter decrease the Jeans length?

How much mass do the volcanoes of Io erupt past escape velocity?

Redshift quantization

What shape are black holes theorized to be?

How close are we to having the technology to measure planetary obliquity for exoplanets?

Is there a single, most prominent helium line?

Good textbooks for a descriptive astronomy course

How exactly does inflation convert random gravity fluctuations into coherent gravitational waves?

Why do we not send diggers to Mars if we think there's underground water?

Convert orbital elements to positions and velocities

Is there anything special about our position in the galaxy thats necessary for life?

Why do we think that there is no two-solar-mass black hole?

Dating very old objects/events

Why doesn't Jupiter increase the chances of an asteroid to strike the Earth?

Cosmological deflation?

How are rogue planets discovered?

What is the speed of light relative to (in space)?