A new study has suggested that it may be possible to stop alien civilizations from discovering us.
The hunt for extrasolar planets has been going from strength to strength in recent years with astronomers having so far identified more than 2,000 of them in orbit around distant stars.
We are able to detect the presence of these far-off worlds by looking out for the tell-tale dimming that occurs when a planet passes in front of its star, a technique that should in theory enable an extraterrestrial civilization to detect our planet as well if they happen to be looking in our direction.
But what if, for some reason, we didn’t actually want to be found ?
In a recent study, Professor David Kipping and graduate student Alex Teachey from Columbia University determined that it would be possible to mask the Earth from being detected while it is passing in front of the sun by firing lasers out in to space. –