An artist's illustration depicts a typical asteroid in our solar system. - ESA The possibility that a huge space rock — once deemed the riskiest asteroid ever observed — could hit the moon now appears ...

Scientists detect alcohol on interstellar comet 3I/ATLAS. The strange discovery could reveal secrets about alien solar systems and cosmic chemistry.

Some of the most revealing objects in the solar system do not belong to it. Comet 3I/ATLAS, only the third confirmed interstellar visitor ever identified, has become a test case for how modern ...

How different can a comet be when it formed around another star? For 3I/ATLAS, the answer is already reshaping how astronomers think about small icy bodies that drift between stellar systems. Only two ...

Asteroids are some of the oldest objects in the solar system: leftovers from the chaotic time when planets were assembling ...

The interstellar comet 3I/ATLAS is leaving our solar system. See new photos from a European Space Agency orbiter on its way ...

The interstellar comet 3I/ATLAS is leaving our solar system. See new photos from a European Space Agency orbiter on its way ...

The interstellar comet 3I/ATLAS is leaving our solar system. See new photos from the a European Space Agency orbiter on its ...

The horizontal coordinate system uses two angles: altitude (or elevation) and azimuth, relative to the observer’s horizon, to locate the celestial object in three-dimensional space. This method is ...

"For asteroids of the size scale relevant to planetary defense (i.e., ∼50-500 m), the mass can only be directly measured ...