Asteroid the size of a building can reach the moon in 7 years

The collision would create a 1 -kilometer diameter crater. The biggest impact on the moon in 5,000 years would release up to 100 million pounds of rocks and lunar dust, according to the modeling of Wiegert’s study. As the moon has no atmosphere, its debris would spread through the lunar surface.

These fragments can also reach Earth -belonging structures. Satellites that orbit the planet, including those used for navigation and communication, may be damaged. On the moon itself, the debris of a few dozen centimeters can endanger astronauts in the earth’s natural satellite, or any structure built there for research and housing, according to Wiegert.

There is absolutely no danger to anyone on the surface (from the earth) (…) we do not expect larger rocks than a sugar cube, and our atmosphere will protect us very well. But they travel faster than a bullet, then if they hit a satellite, they could cause damage.
PAUL WIEGERT, astronomer

“CITIES KILLER”

The YR4 was nicknamed “Cities Killer.” The comparison is due to the size of the regional devastation that the asteroid would cause if it collided with the earth. By the way, before turning to the moon, there was a small possibility that this would happen.