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This week, an asteroid slammed into Earth's atmosphere and exploded in a ball of fire above Siberia. From the time the space rock was spotted by NASA to the time it hit Earth, space agencies around the world had just seven hours to react. Luckily for Earth, this asteroid was only 70cm across and burned up harmlessly in the air - but for asteroid hunter Franck Marchis, this was too close for comfort. Dr Marchis, senior astronomer at the SETI Institute and founder of the UNISTELLAR citizen astronomer network, told MailOnline: 'If it had been slightly bigger, that would been a very different story.' While institutes like NASA and the European Space Agency (ESA) keep a close watch for any space rocks that threaten Earth, there simply aren't enough people watching the sky to catch everything.