For now, the outer reaches of our 4.6 billion-year-old solar system continue to be shrouded in mystery, with the classification of objects changing as scientists gain a new understanding of them ...

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 ...

Close stellar encounters could change the structure of our planetary system, potentially dooming Earth or other worlds to ...

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home.

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 OF201" by the ...

Arun Rath: So first, tell us more about this Planet Nine hypothesis and the evidence that astronomers see for it. Matthew Holman: Well, let me try to answer a couple of different questions. You asked ...

Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar system was touted more than a century ago.

For the first time, potential signs of the rainbow-like â glory effectâ have been detected on a planet outside our Solar System. Glory are colourful concentric rings of light that occur only ...

There could be a ninth planet in our Solar System after all — and no, it’s not Pluto. Instead, it’s the theoretical Planet X, also called Planet Nine, a wide-orbit planet that would circle the Sun ...

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 ...

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.

Are planets in the solar system that are closer to the Sun older than the ones further away? ... 'Biggest regret of our lives': Kids allegedly lead poisoned in Yellowstone. 4.