Although believed to be gods by many ancient civilisations, who saw them as bringers of life or harbingers of doom, to Isaac Newton they were the key to unlocking the secrets of gravity. Hundreds of years later, a new breed of space mission can show what comets are really made of, where they come from, and their surprising influence on events on Earth.
A rare chance to see space agency footage as a comet strikes Jupiter and is caught on camera. In one of the biggest explosions that have ever been witnessed, scientists discuss the theoretical impact of a relative blast on Earth.
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