There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

Launched in 1977, the twin Voyager 1 and Voyager 2 spacecraft embarked on a Grand Tour of the outer solar system, a feat made ...

Siraj’s Planet Y search started about a year ago when he was trying to find out whether the shape of the Kuiper Belt is flat. “The planets of the solar system have slight tilts up and down, but ...

We actually know very little about what's going on inside Uranus and Neptune, causing researchers to propose that these ...

The simulation of the Solar System that came the closest to the observation was the presence of a small planet, between the ...

New observations suggest that the dwarf planet Makemake is surrounded by faintly glowing methane gas. Scientists are unsure if the gas is contained within a wispy atmosphere or being ejected into ...

Since the 1970s, Voyager 1 has been making groundbreaking discoveries. But its journey is far from over, and it's still ...

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the distance ...

Planets do not emit visible light like stars; they shine in the sky because they reflect sunlight. Exoplanets too reflect ...