Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3,959 miles, Earth is the ...

What is Planet Nine, and where is it? The question has fascinated astronomers for years. Scientists believe a massive ...

The rusty world is full of mysteries—and some of the solar system's most extreme geology. Learn more about Earth's smaller, colder neighbor.

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Astronomers have discovered a brand new cold "super Jupiter" exoplanet, ...

In Star Trek, you might hear a character describe a planet as "M-Class." Here's what that designation means, and how it ...

Our solar system has two ice giants, Uranus and Neptune, but there may have been a third. According to a new study published ...

The unusual system of three “super puff” planets has at least one more planet, revealed by its gravitational tug on other planets An unusual planetary system with three known ultra-low density ...

An exciting new study titled "Soot Planets instead of Water Worlds", by Jie Li and associates, published in August 2025, challenges prevailing assumptions about the nature of many low-density ...

An unusual planetary system with three known ultra-low density 'super-puff' planets has at least one more planet, according to new observations. An unusual planetary system with three known ultra-low ...