Black holes
A black hole is essentially a massive object that has been compressed to such an extremely small size that it becomes a singularity, a point in space in space from which nothing can escape due to its high gravity. At the edge of the black hole, called the event horizon, there exists a border from which nothing can escape (escape possibly hawking radiation) and nothing can ever return. Most people think of black holes as large extremely massive bodies (and most of them are) but interestingly, any object, if compressed to a small enough size can become a black hole. This notion was the basis for the fear that the new CERN particle collider in Europe might create dangerous tiny black holes due the extreme compression of particles in high energy collisions. What’s even more interesting about these theoretical micro black holes is that if they could be caused by CERN, the energy levels of certain particles entering earth’s atmosphere on a routine basis have already been doing this for some time. It may be theoretically possible that microscopic black have been zipping through the earth since its earliest days. Luckily for us these tiny singularities would disappear too quickly to cause any danger.
