Today, it’s believed that Jupiter and Saturn, the largest planets, were the first to fully form, both within a few million ...

PARIS: It's an evocative idea that has long bedevilled scientists: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all our efforts to spot it.Some ...

The curious minds at What If investigate the cosmic chaos caused by swapping the orbits of certain planets in our solar system.

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

Jupiter, the largest planet in the solar system, was 2 to 2.5 times bigger in its earlier life, according to new research. Credit: NASA / JPL-Caltech / SwRI / MSSS / Tanya Oleksuik Jupiter ...

The exoplanet — named 14 Herculis c, or 14 Her c for short — orbits a sunlike star about 60 light-years from Earth in the ...

Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected]. Are planets in the solar system that are ...

Have you ever wondered how long it would take to travel to each planet in our solar system? With vast distances separating ...

This clustering has been interpreted as indirect evidence for the existence of another planet in the solar system, Planet X or Planet Nine, which could be gravitationally shepherding these objects ...

Its size is estimated to be a bit smaller than Ceres, which is the smallest of the solar system's five recognized dwarf planets and has a diameter of about 950km. Pluto, the largest of those dwarf ...