All the Latest Game Footage and Images from Asteroid Core You are isolated on a small meteor and need to build a fire to escape before being destroyed by aliens. Use your limited space to create ...

The spacecraft will be slamming into Dimorphos, a 160-meter chunk of rock orbiting Didymos, a larger asteroid measuring in at almost three-quarters of a kilometer.

Even an asteroid on the smaller end of that range could have a big impact, depending on where it hit the Earth, says Lindley Johnson, NASA's Planetary Defense Officer Emeritus.

A NASA spacecraft rammed an asteroid at blistering speed Monday in an unprecedented dress rehearsal for the day a killer rock menaces Earth. The galactic grand slam occurred at a harmless asteroid ...

The results show that X-rays could play an even bigger role than the initial shock wave itself, though more data needs to be gathered to form a comprehensive asteroid defense plan.

The galactic slam occurred at a harmless asteroid 7 million miles (11.3 million kilometers) away, with the spacecraft named Dart plowing into the space rock at 14,000 mph (22,500 kph).

The galactic grand slam occurred at a harmless asteroid 7 million miles (9.6 million kilometers) away, with the spacecraft named Dart plowing into the small space rock at 14,000 mph (22,500 kph).