After a decade-long search, some scientists say a growing number of clues point to the existence of a hidden planet in the Kuiper Belt beyond Neptune — and they may soon have the opportunity to find ...

Mercury is the smallest planet in our solar system. It is the closest to the Sun and has extreme temperature changes between day and night. Tap to read in detail.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Our solar system ...

The planet Jupiter has no solid ground – no surface, like the grass or dirt you tread here on Earth. There’s nothing to walk ...

"Get a free What If Top 10 book when you sign up for our newsletter: Earth is the only life-supporting planet in our Solar ...

Why haven’t humans colonized other planets yet?  While we dream of expanding across the solar system, there are hidden and complex barriers in our way. This video dives into the scientific, technical ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the total discovered planets count eight. But recently astronomers claimed ...

NASA Solar System Ambassador Ellie White is conducting two astronomy events at the Huntington Museum of Art (HMA) this month.

Astronomers search for a hidden ninth planet beyond Neptune's orbit Gravitational anomalies suggest presence of Planet Nine in Kuiper Belt New telescope technology may soon confirm existence of Planet ...