ExpertAverage RatingsExpertise

Harry Hayfield

Particular expert in eclipses (both solar and lunar), but able to answer most questions about astronomy or refer to a website that can help

Paul Wagner

Astronomy and telescope making. Have made at least seven telescopes, both refractors and reflectors, and have spent 30 years looking at the nighttime sky.

Courtney Seligman

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.

Philip Stahl

I have more than forty years of experience in Astronomy, specifically solar and space physics. My specialties include the physics of solar flares, sunspots, including their effects on Earth and statistics pertaining to sunspot morphology and flare geo-effectiveness.

Patrick Weiler

I`d be pleased to answer questions about any aspect of astronomy, particularly those related to cosmology, astrophysics, and planetary sciences. I can also provide reliable information on unique topics like dark energy, dark matter, black holes, etc.,.

Recent Answers

2015-04-26 Name of star:

My earlier answer was completely wrong (sorry about that). I was in a hurry and tried using some online planetarium software I wasn't familiar with, and must have set it up wrong. Arcturus is high in the

2015-04-17 resolve apparent irrationality of gravity:

In Newton's version of the answer, the force of gravity is proportional to the masses of the objects involved. So the larger the mass, the larger the force. As a result, when objects of different mass

2015-04-05 the Sun:

Hi Liz,    No, it's not possible for the sun to go down and then up during the day. For the sun to go down, it must have gotten up first. Something can't go down without being up! So the sun must have

2015-04-03 the Sun:

Hi Liz,    When you're learning about the earth's orbit, I hope you're also learning about the earth's rotation about its axis. The earth rotates from west to east, so everything in the sky seems to move

2015-04-02 the orbit of earth:

Hello,    I think this previous answer can help to shed some insight,      especially by reference to the diagram showing

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