NASA chief Jared Issacman appears to be among those who support Pluto being reclassified as a planet. Could President Trump sign an executive order?

When NASA’s New Horizons spacecraft flew past Pluto in 2015, it transformed our understanding of the distant dwarf planet.

It's showtime for Pluto. NASA's New Horizons spacecraft has traveled 3 billion miles and is nearing the end of its nine-year journey to Pluto. Sunday, it begins photographing the mysterious, ...

Pluto, reveal thyself, and Earthlings, enjoy the show. On Tuesday, NASA's New Horizons spacecraft will sweep past Pluto and present the previously unexplored world in all its icy glory. It promises to ...

NASA explains Pluto's newly discovered "blue sky" and whether or not potential astronauts could ever witness an Earth-like sunrise. The New Horizons space probe sent back its first color images of ...

Yesterday afternoon, NASA lost contact with its New Horizons spacecraft for an hour for reasons unknown. This is generally not a good thing when you’re working with technology that’s 4.5 light hours ...

NASA'S New Horizons Pluto probe is getting an early workout in the Jupiter system as it uses the gas giant's gravity for a 9,000-mph. boost in speed for the final leg of its journey. The probe will ...

LAUREL, Md. — NASA’s New Horizons spacecraft, which flew past Pluto in 2015, will zip past another icy world nicknamed Ultima Thule on New Year’s Day, gathering information on what is believed to be a ...

Hundreds of people who love the little planet that was dissed, gather every year in the Arizona town where Pluto was ...