How do stars and supernovae create the elements. More physics and astronomy at www.sixtysymbols.com

It's a funny symbol that looks like a seagull – but it helps astronomers learn what galaxies are made of. More at www.sixtysymbols.com

We look at mind-boggling neutron stars and Saturn in this film about the extremes of density. More symbols explained at www.sixtysymbols.com