The European Space Agency's Hera spacecraft is on its way to do follow-up observations of Dimorphos, two years after an earlier probe knocked the mini-asteroid into a different orbital path around a bigger space rock.

Liftoff of the ESA/NASA Hera mission is set for Monday, sending a spacecraft on a two year journey to a familiar asteroid system.

A European spacecraft is on its way to get an up-close look at an asteroid that NASA deliberately crashed its own vehicle into two years ago.