An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

This may explain the strange properties of the orbits of our solar system's planets ... orbits of many planets. More NASA, ESA, Caltech / ISTOCK / GETTY IMAGES PLUS "[T]he puzzle for theoretical ...

Jan. 15, 2025 — New observational data and simulation models have confirmed a new type of planet unlike anything found in the Solar System. This provides another piece of the puzzle to ...

Astronomers may have found a star racing through our galaxy at an incredible speed—dragging a planet along with it! If ...

After graduating from UVA in 2013 and completing her doctorate in planetary science from the University of Arizona in 2019, ...

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

While this parade of planets look to our eyes to be huddled in the evening sky, they are of course spread out across a vast chasm of space across the solar system, separated from each other by ...

Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a host of other puzzles connected to the solar system's deep past ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.