A rare comet from another star system is revealing just how different alien solar systems may be from our own.

The presence of deuterium, an isotope of hydrogen, in 3I/ATLAS suggests the interstellar comet formed in a much colder place ...

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 ...

Earth's Composition Closely Matches Mars, Suggests New Study On Planet's Origins ...

Long before 3I/ATLAS slipped through the inner solar system, its water had already recorded the kind of place it came from.

Ganymede is not only Jupiter's largest moon, but also the largest in our solar system and one of the few that hosts a massive ...

When you think of outer space, you're likely picturing stars, planets and moons. But much of space is filled with clouds of gas, plasma and stardust—known as interstellar clouds.

The layout of our solar system follows a hidden pattern shaped billions of years ago. This video explains why rocky planets ...

We already knew interstellar comet 3I/ATLAS came from somewhere far beyond our solar system. Now scientists have more information on how alien that somewhere really is - a corner of the universe ...

Pluto was believed to be the only body beyond Neptune with an atmosphere. Now, a new discovery in our solar system is ...