Every 378 days, Saturn swings into opposition, bringing it closer, brighter, and nearly 10 times easier to observe than at ...

The Kuiper Belt is loosely defined as a doughnut-shaped swath of space beginning just beyond the orbit of Neptune and ...

A sci-fi idea is gaining supporters, from billionaires to city councils. Whether it's feasible is another matter.

Federal funding is about to run out for 19 active space missions studying Earth's climate, exploring the Solar System, and probing mysteries of the Universe.

NASA's Voyager 1 launched 48 years ago in September 1977 on a decades-spanning journey to study the cosmos and search for ...

American space agency NASA names the four people of the second Crew Health and Performance Exploration (CHAPEA) Mars simulation mission.

Though this visitor came to us with no name, we’ve given it one: Comet 31/ATLAS. Astronomers have also officially classified ...

Mars, our reddish-hued neighbor in the solar system, oh how you have captivated us earthlings, fueling an obsession at the ...

I/Atlas is estimated to be 3.5 miles wide, roughly the size of 22 football fields. It is an interstellar comet discovered by a Chilean observatory.

For centuries, humans have gazed into the night sky, wondering what lies beyond the planets we know. Each new discovery in the Solar System reshapes our sense of place in the cosmos. Now, astronomers ...

Scientists may have found the first planet ever detected around our closest “solar twin,” a star called Alpha Centauri A, the same real-life star that was home to the fictional moon Pandora in James ...

Somewhere at the edge of the solar system a new Earth-sized world might be lurking, dubbed Planet Y. Astronomers have long proposed that there might be hidden planets beyond the Kuiper belt, a region ...