A comet tearing through the inner solar system at roughly 58 kilometers per second formed between 10 and 12 billion years ago, according to isotopic measurements published this year. That would make ...

An interstellar object currently passing through our solar system might be one of the oldest comets we have ever seen, originating from a star billions of years older than our own. Comet 3I/ATLAS was ...

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically different from anything known to have ever formed around our sun ...

It may not feel like it, but everything in the universe is in constant motion. Our Sun, with all its planets, orbits the center of the Milky Way, flying through the cosmos at around 450,000 miles per ...