The ion tail appeared as Comet C/2025 R3 PanSTARRS was about 45 million miles from Earth (72 million kilometers) during its ...

Astronomers analyzed the vapors coming off the comet when it neared the sun and found it had a lot of "heavy" water. That ...

Research findings are available online in the journal Nature Astronomy. The original story “ Interstellar Comet 3I/ATLAS ...

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically ...

Here's how to see Comet PanSTARRS in satellite images ahead of its close approach to Earth on April 26.

Interstellar comet 3I/ATLAS is even more extreme. The ratio of semi-heavy water to regular water is 30 times larger than in ...

Each week, four boys and four girls are nominated to represent their schools and their sports, but it's up to fans like you ...

While the best chance to see the comet was on April 17 when it reached perihelion (the point in a celestial object's orbit ...

Comet C/2025 R3 (PanSTARRS) displayed a striking second ion tail as it made its closest approach to Earth on April 26, captured by NASA/ESA’s SOHO spacecraft. The phenomenon occurs when solar ...

A new study suggests that the comet that rambled past us from another star last year likely originated in a cold, isolated ...

3I/ATLAS is now sailing away from Earth and our solar system itself, but astronomers have already learned a wealth of ...

Comet C/2025 R3 is putting on its final show as it passes close to the Sun before leaving the solar system forever.