Visitors to Lowell Observatory follow a path of descriptive signs and busts, named the Pluto Walk, leading to the room where Clyde Tombaugh spent hours peering into the heavens.

Nestled atop Mars Hill in Flagstaff, Lowell Observatory has been a cornerstone of astronomical discovery since 1894 — and ...

Adam Nimoy, the only son of "Star Trek" legend Leonard Nimoy, is one of the keynote speakers at the annual I Heart Pluto Festival in Flagstaff.

Despite its downgrade in 2006, Pluto, which was discovered in Flagstaff, Arizona, may soon regain its planetary status — at least in the minds of the Arizona Legislature.

[I Heart Pluto Fest 2025 Audio]: 95 years ago this week, there's a 24-year-old, Kansas Farm Boy that had been working here in Flagstaff for about a year, and he had discovered a planet earlier ...

Pluto, darn it, it was discovered here.” Flagstaff has a lot of pride for Pluto. Thursday kicks off the annual “I Heart Pluto” festival to celebrate when it was discovered in February 1930.

That came just after the March 6 announcement that Lowell ranked No. 1 in Newsweek's readers choice list of 10 best science museums in the United States. That recognition emphasized Lowell’s ...

Venus square Pluto = power struggles and passionate flares. On Monday, June 9th, Venus — our planet of love and attachment — forms a charged and challenging square with Pluto, our power planet ...

Pluto, our power planet of seismic change and karmic retribution, is stationing direct in the sign of the sea goat for the final time in our lifetimes. Pluto's last push in Capricorn marks the end ...

Exterior of a telescope at Lowell Observatory in Flagstaff, Arizona. Clyde Tombaugh was working at Lowell in 1930 when he discovered the former planet Pluto.

In July, The Arizona Republic readers bestowed another nickname on Flagstaff: Ultimate Arizona road trip destination.Start the day smarter. Get all the news you need in your inbox each morning.

Astronomer Clyde W. Tombaugh discovered Pluto on Feb. 18, 1930, at the Lowell Observatory in Flagstaff, Arizona. It appears Pluto Day sprang up naturally as an informal anniversary holiday, but it ...