A mystery interstellar object discovered last week is likely to be the oldest comet ever seen – possibly predating our solar system by more than three billion years, researchers say. The "water ...

I/ATLAS might be over 7 billion years old, a new study reports, which would make it the oldest comet known. But experts caution we need more data.

A newly discovered comet, 3I/ATLAS, may be the most ancient visitor ever detected, potentially older than our solar system itself. Unlike previous interstellar objects, this ice-rich comet seems to ...

Here's everything to know about the James Webb Space Telescope, and what it captured on its three-year anniversary observing the cosmos. To mark Webb's third year of operations, NASA shared an image ...

A renowned physicist believes he's cracked the mystery of where a giant unidentified object hurtling through our solar system ...

The interstellar comet 3I/Atlas is the fastest and largest of its kind, giving astronomers a rare glimpse into extrasolar ...

The awe-inspiring distances of the cosmos are hard to visualise, so how can we be certain we are measuring them correctly?

Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than ...

This particular isotope burns away quickly inside stars due to their intense heat. But in cooler objects like brown dwarfs, ...

Solar systems mostly keep to themselves. What’s ours is ours and what’s not is not. Stars are simply too far from each ...

The planets in order from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. If you include the ...