Astronomy/Stars

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Question
How do stars stay together so well?

Answer
Hi Corissa,

The answer is gravity. The same thing that keeps the earth together also keeps the stars together. But stars are gas, aren't they? Yes, but even the gas molecules are attracted to other gas molecules by gravity. When you have lots of gas molecules, like in stars, there's lots of gravity - enough to keep the stars together and enough to generate the heat necessary for the star's nuclear furnace to start.

Hope that helps.

Prof. James Gort

Astronomy

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James Gort

Expertise

Questions on observational astronomy, optics, and astrophysics. Specializing in the evolution of stars, variable stars, supernovae, neuton stars/pulsars, black holes, quasars, and cosmology.

Experience

I was a professional astronomer (University of Texas, McDonald Observatory), lecturer at the Adler Planetarium, professor of astrophysics, and amateur astronomer for 42 years. I have made numerous telescopes, and I am currently building one of the largest private observatories in Canada.

Publications
StarDate, University of Texas, numerous Journal Publications

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