In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new dwarf planet. It's called 2017 OF 201, a rock that appears to be some 700 ...

In 1977, NASA launched Voyager 1 and 2 on a mission to explore the outer planets. Now, over 45 years later, these incredible probes are detecting something mysterious beyond the edge of our solar ...

Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, speeding through our celestial neighborhood.

Beyond Neptune, the solar system stretches out to around 100 astronomical units (AU), which is 100 times the distance between Earth and the sun. For context, the most distant planet from the sun ...

This diagram shows the trajectory of interstellar comet 3I/ATLAS as it passes through the solar system. It will make its closest approach to the Sun in October.

International astronomers have for the first time witnessed the birth of a planetary system beyond Earth's sun that could one ...