Devastating asteroid impacts are thankfully incredibly rare, with millions of years between impacts. One thing that’s not rare is the killer asteroid scare story.
Today’s Mail claims ‘Doomsday’ asteroid could slam into the Earth on April 13, 2036… but don’t worry, we’ll have seven years’ warning, ominously following that with “Warning comes days after another asteroid shot over the Pacific just 3,400 miles above the Earth’s surface”
First of all, the asteroid that shot “just” 3,400 miles over the Pacific? That was Asteroid 2011 CQ1, and it was about the size of a washing machine. That’s not dangerous. At all. According to NASA, “there is likely to be nearly a billion objects of this size and larger in near-Earth space and one would expect one to strike Earth’s atmosphere every few weeks on average“. Far from being dangerously close, this asteroid was unusual in that it didn’t quite hit us – if it had, it would have burnt up harmlessly in the atmosphere and no-one bar a few astronomers would have noticed.
Anyway, the “”doomsday” asteroid” in question is Apophis, a name you’ll probably recognise from previous media frenzies in 2009, 2008, 2007 and 2005. Nothing has changed since then; in fact, the odds of collision are gradually getting longer (its position on the danger scale has dropped from 4 – a 1% chance of dangerous impact – to zero). We’ve got a fairly good idea of what the asteroid’s path looks like, but there’s a tiny bit of uncertainty we’ve still not cleared up and it’s possible that it might be on a path that will eventually hit Earth. Luckily for us, the odds that it’s on that path are just 1-in-250,000 (your odds of being killed by Apophis are roughly the same as the odds of being killed by rats or cave-in, apparently). We’re talking lottery odds here.
For a more detailed analysis, there’s a great post at Bad Astronomy – Repeat after me: Apophis is not a danger!
As Nick Ross used to say, don’t have nightmares.