3I/ATLAS is only the third object of its kind ever observed, following the interstellar asteroid 1I/ʻOumuamua in 2017 and the interstellar comet 2I/Borisov in 2019.

Geologists have discovered compelling evidence for preservation of Hadean rocks -- dating back to 4.16 billion years old -- in a complex geological sequence called the Nuvvuagittuq Greenstone Belt, ...

Astronomers have analyzed a statistical sample of 111 edge-on disk galaxies at various periods -- up to 11 billion years ago, or approximately 2.8 billion years after the Big Bang -- using archival ...

Using data from several space- and ground-based telescopes, NASA astronomers have captured a stunning new image of the Andromeda galaxy, which is the closest spiral galaxy to the Milky Way.