http://www.express.co.uk/news/nature/566159/NASA-alert-asteroid-2014-YB35-near-hit-Earth
NASA on alert as HUGE Asteroid 2014-YB35 set to 'skim past Earth' at 23,000 mph on FRIDAY
A MAMMOTH asteroid capable of wiping out an entire country is on a near-collision course with Earth, it has emerged.
...............Though its exact size is unknown it is estimated to be from between 500 metres and 1km wide with 990 metres the most likely.
The object was first spotted by the Catalina Sky Survey at the end of last year with astronomers expected to be closely watching its progress this week.
Astronomers have named June 30 as Asteroid Day to highlight the dangers of Potentially Dangerous Asteroids (PHAs) hurtling through space.
Initiative co-founder Grigorij Richters warned there are thousands which have not been identified which could ”destroy life”.
He said: “It just takes one asteroid to completely destroy life, not just humanity, but all species.
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