What do you think is the biggest threat to the Earth from space?

On 15 February 2013 a large meteor burst through Earth's atmosphere injuring almost 1000 people in its wake. This space rock appeared over a remote part of Russia without warning, had it hit a more densely populated area – the impact could have injured, or even killed, thousands more. But what do you think is the biggest immediate threat to the Earth from space?

 

ESO
Gamma ray bursts
25% (54 votes)
Rogue meteors or asteroids
67% (147 votes)
A star going hypernova
4% (9 votes)
Supermassive black holes
5% (10 votes)
Total votes: 220
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