Spacefarers may contaminate other worlds—but scientists have plans to keep the cosmos clean
In his inauguration speech in January, United States President Donald Trump declared the US would "plant the stars and ...
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'City-killer' asteroid 2024 YR4 could hit the moon instead of us, scientists say
YR4 has a 2.3% chance of hitting Earth in the year 2032. But according to new estimates, it may have an even smaller chance ...