The interstellar comet will pass safely by Earth, giving astronomers their best chance to study it up close. Interstellar comet 3I/ATLAS will make its closest approach to Earth on Friday, Dec. 19, ...

The interstellar comet known as 3I/Atlas will pass within 167 million miles of our planet Friday – the closest it gets on its ...

Perihelion is the point at which an orbiting body is closest to the sun. The word comes from Greek and literally means around (peri) the sun (helios).

While the Voyager spacecraft are constantly traveling out of the Solar System, sometimes they are getting closer to Earth.

Later in December, the 3I/ATLAS interstellar comet will get as close to Earth as it ever will. Here's what to know.

Astronomers monitoring the interstellar object known as 3I/ATLAS say new observations show an unexpected shift in the orientation of its rare "anti-tail" as the object approaches its closest point to ...

The interstellar comet 3I/ATLAS is currently visible in the constellation Leo, though its faint brightness of magnitude 12.5 ...

Interstellar object 3I/ATLAS nears Earth, showing a rare anti-tail, changing brightness, and new clues about its origin, with ...

Comet 3I/ATLAS will get closest to Earth on Dec. 19, and astronomers will be watching.

The latest image of the comet was captured by scientists using the Gemini Multi-Object Spectrograph (GMOS) on the 8.1-meter ...

The best night of the year to see Saturn shining over Indiana happens this week as the ringed planet makes its closest approach to Earth. You should be able to spot Saturn in the night sky with just ...

The moon will appear slightly larger and brighter Monday night during what's known as a supermoon. October's supermoon is the first of three this year. It happens when a full moon is closer to Earth ...