Comet Hartley 2 by Nick Howes from Cherhill, UK on October 22

Comet may deliver firework show

A green comet that has been passing close to Earth this month, setting a challenging target for amateur astronomers, may be set to produce a meteor shower. The green cloud is from deadly cyanide gas but there is no danger.

A frame shows the asteroid as stars trail

Small asteroid grazes the Earth

An amateur astronomer has captured the moment a small asteroid skimmed past the Earth yesterday, coming to within 46,000 km (29,000 miles) of us.