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

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

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

To better understand why the planets have variable compositions ... to the formation of the gas and ice giants in the outer solar system. This first-order model of planetary growth in the solar ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But do other planets in the solar system have them too?

Canadian astronomers have taken an extraordinary step in understanding how planets are born, using the James Webb Space ...

one which can offer superb views of the other bodies in the solar system. But which one to choose? We've got you covered with our guide to the best telescopes for seeing planets. Now's a great ...

"Uranus and Neptune, two very distant ice giant planets out in our solar system, are also there in ... Saturn will appear as a yellowish-white body with moderate brightness, according to Space.com.

"Uranus and Neptune, two very distant ice giant planets out in our solar system, are also there in the sky," Dyches said. "But they are very faint." MORE: This is how close NASA's Parker Solar Probe ...