The six-mile-wide asteroid punched a one-way ticket toward extinction for all non-avian dinosaurs. Some 66 million years ...

which was the likely impact site of the 6-mile-wide asteroid that 65 million years ago caused the extinction of not only the ...

Once the new measurements were taken and the math was done, the probability of YR4 hitting the Earth began to decline, ...

The 700–1,300 feet-wide space rock deformed rocks more than six miles from the impact site when it hit 600 million years ago.

"Scientifically there's a huge amount we can learn from asteroids," says Alan Fitzsimmons, an astronomer at Queens University ...

At approximately 40 to 90 meters (130-300 feet) wide, the asteroid is far smaller than the 10-kilometer (6-mile) asteroid that wiped out the dinosaurs but still large enough to devastate a major city.

Unlike the six-mile-wide (10-kilometer-wide) asteroid that wiped out the dinosaurs 66 million years ago, 2024 YR4 is classified as a "city killer" — not a global catastrophe, but still capable ...

New observations of a small asteroid discovered in December have led astronomers to conclude that the chances of it striking Earth are almost zero after earlier data had indicated a higher risk of a ...