Researchers say dark streaks along the heart's rim are actually stains left by liquid nitrogen that recently seeped through ...

Dark streaks along Pluto’s giant nitrogen glacier may mark places where liquid nitrogen recently reached and flowed across ...

A new analysis of New Horizon images of the Sputnik Planitia, a section of Pluto’s massive, heart-shaped glacier, suggests ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Scientists claim to have solved the mystery behind the heart shape on ...

For the first time since its discovery in 1920, Pluto is entering the outer solar system—a journey that’s slowly thinning out ...

A new study led by Southwest Research Institute (SwRI) provides evidence that liquid nitrogen is rising to Pluto's surface ...

Nine years, 3 billion miles, and $700 million later, we are finally getting the very first high resolution photos of Pluto, thanks to a NASA spacecraft called New Horizons. It’s a pretty small planet ...