Fireball over Japan part of larger asteroid that might one day hit Earth

A fireball that lit up the Japanese skies in 2017 was a part of a big one which might one day slam into Earth, scientists have worked out.

The asteroid that burned up in the atmosphere over Kyoto in April that year was smaller than a ping pong ball, but its parent 2003 YT1 is about 2km across - the length of Auckland's Queen St.

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