helium
The many uses for helium, but are we running out of it?
© American Chemical Society (A Britannica Publishing Partner)
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Encyclopædia Britannica, Inc.Many consider Brian May to be the greatest guitarist of all time. He's also an astrophysicist.
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© Massachusetts Institute of Technology (A Britannica Publishing Partner)Learn about extrasolar planets (exoplanets) and the techniques used to detect them.
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© Open University (A Britannica Publishing Partner)Overview of a plan for the Gaia satellite to take a “census” of stars, film 2013.
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Encyclopædia Britannica, Inc.Kepler's theory of the solar system.
