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The asteroid known as 2024 YR4 is out of sight yet still very much on scientists’ minds.

The building-sized object, which initially appeared to be on a potential collision course with Earth, is currently zooming beyond the reach of telescopes on its orbit around the sun. But as scientists wait for it to reappear, its revised trajectory is now drawing attention to another possible target: the moon.

Discovered at the end of 2024, the space rock looked at first as if it might hit our planet by December 22, 2032. The chance of that impact changed with every new observation, peaking at 3.1% in February — odds that made it the riskiest asteroid ever observed.

Ground- and space-based telescope observations were crucial in helping astronomers narrow in on 2024 YR4’s size and orbit. With more precise measurements, researchers were ultimately able to rule out an Earth impact.

An animation depicts YR4's close approach of Earth before discovery in December 2024. European Space Agency
The latest observations of the asteroid in early June, before YR4 disappeared from view, have improved astronomers’ knowledge of where it will be in seven years by almost 20%, according to NASA.

That data shows that even with Earth avoiding direct impact, YR4 could still pose a threat in late 2032 by slamming into the moon. The impact would be a once-in-a-lifetime event for humanity to witness — but it could also send fine-grained lunar material hurtling toward our planet.

While Earth wouldn’t face any significant physical danger should the asteroid strike the moon, there is a chance that any astronauts or infrastructure on the lunar surface at that time could be at risk — as could satellites orbiting our planet that we depend on to keep vital aspects of life, including navigation and communications, running smoothly.

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