Researchers lost 900 marks of asteroids near Earth

The new study shows that scientists lost more than 900 asteroids belonging to the group near Earth.

More than 900 asteroids of them have lost track after their first discovery.

About 17,000 Earth asteroids were discovered in the period 2013-2016. More than 900 asteroids of them have lost track after their first discovery.

The reason is that it is difficult to calculate their trajectory when observing it once . Asteroids can fly to a very far point if not detected again in a few hours. They may also be too fast or too fuzzy to observe.

Scientists are tracking the majority of large asteroids that could endanger the Earth. The new study was conducted by the team at the Harvard-Smithsonian Center for Astrophysics.