"Big Brother" Season 27 is here. Here's what time "Big Brother" comes on tonight, the "Big Brother" 27 schedule, and when ...

Pluto was discovered at Lowell Observatory in Flagstaff, Arizona in 1930 and was considered our ninth planet until 2006. The International Astronomical Union reclassified Pluto as a dwarf planet ...

Arizona has declared Pluto as its “official state planet” — despite it being relegated to “dwarf planet” status nearly two decades ago.

Pluto was the little planet that could — until it couldn’t. Discovered in 1930 at Lowell Observatory in Flagstaff, Arizona, Pluto was hailed as the ninth planet in our solar system. For ...

The James Webb Space Telescope (JWST) has discovered that a hazy sky over frozen Pluto is helping to cool the dwarf planet's atmosphere, while at the same time giving methane and other organic ...

“The reason that Pluto and Charon are so interesting is because Charon is 50 percent the size of Pluto,” said Adeene Denton, a planetary scientist at the University of Arizona who led the paper.

The astronomers at Lowell Observatory in Arizona are showing Pluto some love on the 95th anniversary of its discovery, regardless of whether we call it a planet or not.

When did Pluto stop being a planet, and why? Pluto was always in a tough spot when it came to being a planet. Just 1,477 miles across, it's only one-fifth the diameter of Earth.

Nestled atop Mars Hill in Flagstaff, Lowell Observatory has been a cornerstone of astronomical discovery since 1894 — and it’s still inspiring curiosity today.

To mark the occasion, The Lowell Observatory in Flagstaff, Arizona, where Pluto was discovered, is hosting its sixth annual "I Heart Pluto" festival. But should they? Is Pluto even a planet?

Pluto: Arizona’s homegrown ‘ planet ’ The I Heart Pluto Festival began in 2020, 90 years after Pluto’s discovery at Lowell Observatory in Flagstaff.