Add Yahoo as a preferred source to see more of our stories on Google. The European Space Agency's ExoMars Trace Gas Orbiter image of interstellar comet 3I/ATLAS as it passed close to Mars. (The ...

This summer, scientists spotted an incredibly rare visitor to Earth’s solar system—a comet, now known as 3I/ATLAS, that entered our solar system from the galaxy beyond and is zipping past the sun at a ...

"Returning the scientifically selected samples that await us on Mars, as part of a balanced portfolio, will help to ensure the US does not cede leadership in deep space to other nations, such as China ...

Ask someone on Earth for the time and they can give you an exact answer, thanks to our planet’s intricate timekeeping system, built with atomic clocks, GPS satellites and high-speed telecommunications ...

Add Yahoo as a preferred source to see more of our stories on Google. FILE PHOTO: The planet Mars taken by the NASA Hubble Space Telescope when the planet was 50 million miles from Earth By Will ...

A mysterious interstellar comet — just the third such object ever confirmed to have entered our solar system — streaked past Mars last week. A spacecraft in orbit around the red planet had a front-row ...