When you look at the solar system, you might notice that the planets' orbits are tilted, and oddities in the protoplanetary ...

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 ...

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

"This finding is the first direct evidence of water’s interstellar journey from clouds to the materials that form planetary ...

What do you do when you encounter a strange astronomical event, a collection of data from planets thousands of light-years away, and models that can't ...

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

Planetary size was determined pre-spacecraft by measuring the planet's angular diameter and its distance from Earth (in AU, later converted to terrestrial units after the AU was accurately measured ...

The discovery of ancient water in a planet-forming disk reveals that some of the water found in comets—and maybe even ...

For the first time, astronomers have witnessed the early stages of planet formation around a distant young star, HOPS-315, ...

The number of confirmed planets outside of our solar system—known as exoplanets—has risen to 6,000, NASA has said. There is huge variety across these distant worlds, the space agency says, with ...

Our solar system consists of the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, as well as countless asteroids and comets, that are gravitationally bound to the Sun.