The 40ft long Falcon 9 upper stage was left in a 'chaotic' lunar orbit by Elon Musk's SpaceX company following a 2005 US-Japanese mission launched by SpaceX - and has now crashed into the Moon The collision will pose no danger to Earth but will leave behind a lunar crater. Key points and original sources are listed below.

• The 40ft long Falcon 9 upper stage was left in a 'chaotic' lunar orbit by Elon Musk's SpaceX company following a 2005 US-Japanese mission launched by SpaceX - and has now crashed into the MoonS1

• The collision will pose no danger to Earth but will leave behind a lunar crater.S2