Interstellar comet 3I/ATLAS has turned into one of the strangest visitors in the recent history of the solar system, surrounding itself with a vast halo and suddenly lighting up in X-rays in a way ...

Comet ISON, which astronomers think originated outside the solar system, brightens in this five-minute exposure, taken in 2013. Credit: NASA / MSFC / Aaron Kingery A Mashable series about the curious ...

The third known visitor from beyond the solar system is on its way out, retracing the path that brought it past the Sun.

Avi Loeb, Harvard astrophysicist and longtime proponent of the possibility that certain celestial objects could be artificial, doubled down on his theory about 3I/ATLAS during a recent episode of The ...

What's the difference between an asteroid and a comet? A comet is basically a dirty iceball composed of rock and ice. The classic image is of a bright "star" in the night sky with a long curved tail ...

The visibility of the comet is dependent on clear weather conditions Marcos del Mazo/LightRocket via Getty Look up! A bright comet is expected to light up the sky this week. Comet Tsuchinshan-Atlas, ...

The most sensational story of the year for astronomers has been the discovery of the comet 3I/ATLAS, which was first observed on July 1, 2025 by NASA's Asteroid Terrestrial-impact Last Alert System ...

When some scientists and conspiracy theorists saw the strange trajectory of the space object 3I/ATLAS, some of them thought one thing: aliens. With a bizarre shape, an unusually precise trajectory, ...

A Harvard physicist who sounded the alarm earlier this month about a rare interstellar object passing through our solar system — suggesting it might be more than a comet — now says it could even be a ...

What’s the difference between an asteroid and a comet? A comet is basically a dirty iceball composed of rock and ice. The classic image is of a bright “star” in the night sky with a long curved tail ...