The unusual comet—which is to pass Earth again in the coming weeks—is only the third known object to visit us from outside the solar system.

The new study involved taking a fresh look at the "Altamura Man," which is an exceptionally well-preserved Neanderthal skeleton covered in a thick layer of calcite, sometimes called "cave popcorn." The researchers' findings suggest that the size of Neanderthal noses might not have had anything to do with living in cold temperatures.

Harvard's Avi Loeb challenges NASA's silence on 3I/ATLAS and the Local Interstellar Cloud. We reveal how increased cosmic ray penetration risks millions of air travellers.