Of the more than 5,000 exoplanets that have been confirmed so far and many more thousands of candidates, most orbit stars the ...

They know that it is a sub-Neptune planet with a radius 2.35 times that of our planet, and so a volume 13 times that of Earth ...

Over the past decade or so, astronomers have speculated about the characteristics of rogue planets in the Milky Way galaxy.

This is probably the most convincing evidence for Planet Nine so far. It is believed that this planet is five to ten times ...

At the center is the sun, a yellow dwarf star that contains 99.8% of the solar system's mass. Everything else — from the eight major planets to dwarf planets, comets, asteroids, and icy objects ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

The planet is "crumbling to pieces," shedding the equivalent of Mount Everest’s mass every 30.5-hour orbit and will be ...

We tend to think of habitability in terms of individual planets and their potential to host life. But barring outliers like ...

The JWST continues to live up to its promise by revealing things hidden from other telescopes. One of its lesser-known ...

A planet circling at a sharp 90-degree angle to the orbits of its two host stars has now been confirmed. This discovery ...