Astronomy/Expert Profile

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I can answer almost any question about astronomy and related sciences, such as physics and geology. I will not answer questions about astrology and similar pseudo-scientific rubbish.

Experience in the area

I have been a professor of astronomy for over 40 years, and am working on an online text/encyclopedia of astronomy, and an online catalog of NGC/IC objects.


Astronomical Journal, Publications of the Astronomical Society of the Pacific (too long ago to be really relevant, but you could search for Courtney Seligman on Google Scholar)


I received a BA in astronomy and physics and a MA in astronomy, both from UCLA. I was working on my doctoral dissertation when I started teaching, and discovered that I preferred teaching to research.

Awards and Honors

(too long ago to be relevant, but Phi Beta Kappa and Sigma Xi still keep trying to get me to become a paying member)

Average Ratings

Recent Reviews from Users

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    K = Knowledgeability    C = Clarity of Response    P = Politeness
Apoorv09/04/16101010Thank you thank you. Thank you.....for .....
Andrew08/31/16101010Very nice. The link also really helped .....
Prashant S Akerkar 08/31/16101010Dear Prof Courtney Thanks. Prashant
RR08/26/16101010I would like to thank Mr. Seligman .....

Recent Answers from Courtney Seligman

2016-09-22 Moons role in earthquakes:

It appears that lunar tides can slightly increase the number of microquakes in the lower regions of deep fault zones (quakes measuring about 1.0 or less on the Richter scale); but despite many studies

2016-08-31 Rain in other planets.:

In general, the other planets cannot have rain in the sense that the Earth does, but there could be liquid droplets gradually falling relative to the surrounding gases in some part of the atmosphere of

2016-08-31 Capturing Rainbow Images.:

You can use a digital camera to photograph rainbows, but you should not use a telescope to do it. Rainbows cover a broad area, many times larger than the tiny field of view of a telescope. If you used

2016-08-31 AStronomy:

The time that the Sun rises and sets WOULD change by two hours per month, if we used the rotation of the Earth (which takes 23 hours and 56 minutes) to keep time. But that "rotation period" is not the

2016-08-25 Red dwarf star planet:

Another discussion of the planet says that it "is tidally locked, so one side probably faces the Sun all the time". This does not make sense, because if it tidally locked, one side MUST face the star all


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