It's in the top 5% of the largest ever discovered
Sheppard said: “Any asteroid over 1km in size is considered a planet killer.
“The Earth’s surface would likely cool significantly from sunlight not getting to the planet. It would be a mass extinction event like hasn’t been seen on Earth in millions of years.However, the Washington-based scientist warned we cannot predict what could happen when it enters the earth’s orbit and could drift closer to the planet.
"This will be centuries into the future and we do not know the orbit of 2022 AP7 precise enough to say much about its dangers centuries from now.”
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