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ELNJ

Swarthmore, PA

Astronomer, sometime-coder.

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Top Answers
48
Why don't the inner moons of Jupiter have tidally-induced volcanism?
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45
How does the earth cast straight and reversed shadows on the moon?
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25
Was this an astronomical phenomenon observed in 1689?
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19
Is the universe macroscopically transparent to CMB? Is the fraction intercepted by stars and dust so tiny that it doesn't have a correction factor?
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12
Blue color of ion (plasma) comet tails
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9
Why are the time zones calculated as 360°/24 and not 361°/24 or 360°/23.933?
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9
How did Astronomers mostly(?) agree to publish arXiv preprints along with peer-reviewed Journals? Was there pushback?
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9
The physical processes of emission lines in cosmic nebula
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8
As the Moon and the Earth are predicted to get into tidal lock, how slow would the Earth rotate?
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8
How do astronomers detect the 'metals' in a star? If the atoms are presumably completely ionized?
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8
Why does the background noise in this image of 2020 QG look like corduroy?
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7
What's the critical mass of a rocky planet before its gravity traps enough gas in its atmosphere to start becoming a gassy planet
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7
Which stellar properties can we describe as "first principles" in which we can derive the rest?
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7
Accessing SDSS server SQL server via python
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7
Why isn't most hydrogen in the universe molecular (diatomic), instead of atomic (monoatomic)?
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7
Did Cassini return a photo of Saturn's rings shown from closer to Saturn?
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7
Does Oxygen-burning process produce Neon?
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6
Authenticating in a Google sheets application
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6
Do stars have "radio photospheres"? Are they different from their optical photospheres?
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6
Was the "green star" event in NGC 3314 ever figured out or named?
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6
Has a gravitational microlensing event ever been predicted? If so, has it been observed?
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5
Different times of sunset at the same location due to elevation
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5
What is the significance of using baseline pairs in radio interferometry?
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5
Why does Earth have a dip in the CO2 absortion spectrum from 14 to 16 micron?
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