• Question: How big is a star?

    Asked by issi759 to Alessandro, Angela, Claudia, Marina, Phil on 12 Mar 2013.
    • Photo: Alessandro Guazzi

      Alessandro Guazzi answered on 12 Mar 2013:

      It depends which one: stars can vary a lot in size! Some can be only about 20-40km in diameter (neutron stars) and others over 900,000,000km in diameter (supergiants)! As a reference, the earth is about 12,000km in diameter, so a supergiant is to the earth what a football field is to one single hair.

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