Pluto is a bit of a loner. The dwarf planet is no longer considered a regular planet; it does not orbit on the same plane as ...

The year was 2015. After traveling billions and billions of miles through the Erebus, New Horizons encounters the boatman, and the somber lord of the departed. The spacecraft could have been called ...

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Clyde Tombaugh didn't set out to discover Pluto when he sent his sketches of the night sky to Lowell Observatory in Flagstaff, Arizona in 1929. More than anything, he just wanted to get off the farm ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

The planet Neptune wobbled in its orbit around the Sun. That could only mean one thing, astronomers said: There was a ninth planet out there, somewhere, lurking in the fringes of the solar system.

Arizona has declared Pluto its “official state planet” — despite it being relegated to “dwarf planet” status nearly two decades ago. Gov. Katie Hobbs signed legislation on Friday and afterward dodged ...

If the title "How I Killed Pluto" makes you cringe, hear author Mike Brown out. The Pluto in question isn't Mickey Mouse's loyal friend but rather the former ninth planet in our solar system. Even so, ...

The US state of Arizona has taken the unusual step of naming a state planet. Even more unusually, they have chosen Pluto – which is not a planet – as their representative in the solar system. A ...

On January 17, 2006 the New Horizons mission will launch for Pluto, the last unexplored planet of the solar system — or is it? Some scientists now claim that Pluto does not deserve its planetary ...

At the vast edge of the solar system, Pluto has long been perceived as a cold and lonely dwarf planet. However, a recent groundbreaking study has revealed that it may have had an extraordinarily fiery ...