"It is possible that a planet once existed in the solar system but was later ejected, causing the unusual orbits we see today."

It's the earliest stage of planet formation ever seen by scientists. The new planetary system is taking shape around HOPS-315, a baby star which is located 1,300 light years from Earth in the Orion Nebula. Experts say that the discovery could help better understand the beginnings of our own Solar System.

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's not aliens.)

The deep-space optical communication link could revolutionize how scientists communicate with spacecraft as they explore the solar system.

I/ATLAS, earlier known as A11pI3Z, is only the third interstellar visitor to be discovered passing through our corner of the galaxy.

Astronomers unveiled a striking view of the new interstellar visitor 3I/ATLAS on its journey toward the inner solar system.

Two meteorites found in the Sahara in 2023 might be from Mercury, a study suggests, but doubts remain due to how little is known about the planet closest to the sun.

Despite the powerful telescopes that modern astronomers have to work with, the distant reaches of the Solar System are still mysterious.