The monstrous 85-mile-wide comet C/2014 UN271 is the second most distant body originating from the Oort Cloud found to be chemically active.

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Sedna will make its closest approach to the Sun in 2076, giving us a rare opportunity to visit the planetoid before it drifts ...

Scientists want to study a distant world in the solar system that is classified as a dwarf planet. But some experts think it ...

Sedna, a distant dwarf planet three-quarters the size of Pluto, is inching toward the brightest star in our sky — and in 2076 ...

A cosmic body from another star system has entered Earth and is the largest one ever seen. In the previous decade, two other ...

The comet will zip past Mars’s orbit and reach its closest point to the Sun on 29 October 2025, at 1.35 astronomical units.

Astronomers have discovered a new interstellar comet passing through our solar system, marking the third interstellar object ...

Imagine waking up one morning to the news: a black hole is drifting close to our solar system. It sounds like the plot of a .

It appears our solar system is getting more popular with out-of-towners. Astronomers may have found a third interstellar ...

The Interstellar Boundary Explorer (IBEX) is a small satellite already orbiting Earth. IBEX has special instruments gathering ...

A team of researchers has outlined how a new "direct fusion drive" propulsion system could allow us to reach Sedna this ...