Breaking space news, the latest updates on rocket launches, skywatching events and more! He called this hypothetical world "Planet X." "In some ways, Pluto's more of a planet than some of the ...

NASA's New Horizons spacecraft conducted the first and only flyby of the Pluto system, culminating at the closest approach of that distant world in July 2015. Sailing onward, the probe carried out ...

Both probes are the only spacecraft to operate beyond the heliosphere, the sun’s bubble of magnetic fields and particles that ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

The Sunbird nuclear fusion rocket concept has the potential to more than halve the time to travel to Mars and cut travel time ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. This high-resolution image captured by NASA's New Horizons spacecraft combines blue, red and ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

Many astronomy enthusiasts know of Alan Stern, the Principal Investigator of the New Horizons spacecraft mission that conducted a flyby of the Pluto system in 2015. Stern is an outspoken critic of ...