An artistic rendition of our solar system, including the Sun and eight planets. vjanez/iStock via Getty Images Christopher Palma, Penn State and Lucas Brefka, Penn State Curious Kids is a series for ...

Our solar system once had nine planets, but things changed when Pluto lost its planetary status in 2006. Ever since, astronomers worldwide have hunted for signs that we might still have a ninth planet ...

This process, called accretion, is how everything in the solar system – planets, moons, comets and asteroids – came into being. Telescopes can see young solar systems being born.

– Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about 4½ billion years ago.

Download this Solar System Planets Clipart Set Colorful Planets Drawing In Outer Space Galaxy Clipart Collection For Elementary And High School vector illustration now. And search more of iStock's ...

HR 8799 is a system that was born 30 million years ago, and so is young compared to our solar system, which has existed for 4.6 billion years. Still hot from their violent formation, the planets ...

"The Solar Family" is an 11-minute educational film produced by Encyclopedia Britannica Films in 1936. It presents the evolution of the solar system through the lens of the planetesimal hypothesis ...

Normally we could not see planets directly at this distance, even with the JWST, but the planets in the HR 8799 system are so young that they are still intensely hot from the formation process.