Duck!

What will you be up to on the 1st April? This is not an April fool's joke, but one of the things that will happen to you that day is that you will be narrowly missed by a sixty metre long asteroid called 2012EG5. It will be travelling at about 8km per second relative to the Earth, and will pass us at a distance of about 150 000 miles. There is absolutely no danger from this encounter, but it is the sort of thing that happens all the time without anyone really noticing. Objects like this are classed as NEOs - Near Earth Objects, and they have orbits that bring them, unsurprisingly, near to the Earth from time to time. One day in the future a NEO might  occupy the same orbital position as the Earth, at which point interesting events would unfold fairly rapidly. Astronomers are sure (to a high degree of precision) that there is virtually no chance of the currently known 1301 potentially hazardous NEOs hitting us any time soon.