VIDEO: Nasa tracking Asteroid TB145

An asteroid called TB145 will pass within a few hundred thousand kilometres of the earth.

Astronomers only discovered its existence this month.

Scientists say it will not hit us for a least 100 years.

Tim Allman reports.

Article source: http://www.bbc.co.uk/news/science-environment-34684761#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

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