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

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

Mars' southern hemisphere absorbs a lot of the sun's energy during the Red Planet's spring, and that may be causing Mars' ...

Experts told Newsweek about the difficulties of reaching Mars as the United States faces complex challenges in space policy.

Refueling in space will be an essential part of getting a crew ... SpaceX has continuously stated the ambition to launch an uncrewed Starship to Mars in 2026, when the planet will be closest to Earth.

"Rootless cones form when lava flows over wet or icy ground, causing it to boil and explode," said Dundas. "The region around ...

Worlds will align for a "planetary parade" in January, with four bright and easily visible to the naked eye. But an even ...

A world-leading designer of space robots says gigantic new rockets being tested by billionaires Elon Musk and Jeff Bezos are ...

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

During his inaugural address, President Donald Trump said he wants 'American astronauts' on Mars. Where does a future Mars ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...