As of February this year, there are 128 million debris objects in orbit, according to the European Space Agency. Roughly 34,000 of those objects are greater than 10 cm.
Experts believe a defunct Russian satellite and a discarded Chinese rocket could smash into each other high above the earth on Thursday around 8:56 p.m. E.T. There is around a 10% chance this will occur. The objects, with a mass of roughly three metric tons, were in low-Earth orbit at an altitude of around 615 miles. "If this turns into a collision, it's probably thousands to tens of thousands of new pieces of debris that is going to cause a headache for any satellite that's going out into upper low-Earth orbit, or even beyond," said Dan Ceperley.
Source: 'Very high risk' defunct Russian satellite and Chinese rocket body will collide tonight: report