Mars has two moons, but they're not quite like Earth's moon. That's raised a lot of questions about where they're from, ...

When Earth is opposite Mars from the sun, it will appear full because you’re looking directly on the daylit side. But ...

The method, developed by researchers at the State University of Campinas in Brazil, uses images of dune surfaces to estimate ...

The universe has quasi-moons, mini-moons, and moonlets, but no official definition of what counts as a moon.

A new scientific theory on solar tide effects has dramatically improved the accuracy of calculating how much faster clocks ...

Bringing samples from Mars back to Earth is one of NASA's most ambitious goals. The plan goes back to the 1970s, with NASA's robotic exploration program, when the first spacecraft landed on the ...

The Earth often gets a few visitors in the solar system, but some stick around for a while. Here's what to know about the ...

As mankind was planning the first moon landing in the 1960s, an asteroid approached Earth—and still hasn’t left.

Mars’ north polar vortex locks its atmosphere in extreme cold and darkness, freezing out water vapor and triggering a ...

SpaceXs Starship Completes 11th Unmanned Earth-Orbit Test Flight The spacecraft deployed eight satellite panels, advancing ...

As an astronomer studying the universe beyond Earth, I’m fond of “outside the box” views almost by default. But one of my favorites is whenever a spacecraft takes a snapshot of our home world and the ...