Yet, their motion and arrangement defy straightforward ... Related Stories ・Scientists discover the closest Earth-sized ...

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? – ...

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.

Using the ALMA radio telescope array, astronomers have investigated the disks of gas and dust around young binary stars to ...

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 ...

Our Solar System hasn’t always had the arrangement of planets we see today. Past iterations put other planets through the wringer, and some of them got booted — including a long-lost alternate ...

The arrangement of Venus ... according to NASA/JPL Solar System Ambassador Brenda Culbertson. The two planets will act as the “eyes” of the “smile,” with the delicate crescent Moon ...

One set of dots had matching colors and brightness. open image in gallery Is there a possible ninth planet in our solar system? Researchers say they may have found a candidate (Credit: ESO/Tom ...

This mathematical arrangement – an example of what ... for long-duration studies of exoplanet targets (planets beyond our solar system) – that all six with their interrelated orbital periods ...

Pluto was reclassified as a dwarf planet in 2006. 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 ...