In an exciting breakthrough in planetary science, a recent study has increased the likelihood of Planet Nine’s existence by ...

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.

For decades, our solar system was thought to have nine planets, with Pluto considered the smallest and farthest. But in 2006, Pluto was officially reclassified as a dwarf planet by the ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet ... that could be a possible candidate as "Planet Nine," according to a new paper, which has been ...

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 closer to the Sun older than the ones further away? – ...

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 ...