YR4, which orbits the sun every four years and periodically crosses Earth's orbit. The nature of its orbit makes it a ...

(There's also small chance, 0.8 percent, that the rock could hit the moon.) The detection shows that the system for defending Earth from lethal space rocks works like a well-oiled global machine.

No, it's unlikely 2024 YR4 will hit the Earth when it passes by on Dec. 22, 2032, updated astronomer predictions say. The probability of impact initially was revised upward twice to a record 3.1% ...

Calculations of Apophis' trajectory become precise by 2013 which enabled scientists to understand that it was not going to hit Earth.