Some seriously large asteroids have threatened Earth before. Some of these asteroids have little chance of hitting us but there are a few with very real chances of making contact. Watch the full episo ...
The European Space Agency (ESA) has successfully launched Hera, its first planetary defence mission designed to assess whether future asteroids can be deflected from a collision course with Earth.
The asteroid was not on course to hit Earth, but it was a test to see whether space agencies could do it when there is genuine risk. When it arrives in two years, the Hera craft will look at the ...