Pluto-Palooza at Flagstaff's Lowell Observatory

The Lowell Observatory, located just 1 mile from downtown Flagstaff Arizona atop a mesa known as Mars Hill, is most famous for being the site of the discovery of Pluto. Founded in 1894 by Boston mathematician/astronomer Percival Lowell, this observatory is one of the oldest in the country. In 2011, the observatory was recognized as “One of the world’s 100 most important places,” by TIME. Flagstaff was awarded the title of World’s 1st International Dark Sky City on October 24, 2001, making it the perfect place for stargazing due to minimal light pollution.

Amazing views!

The tree-lined grounds are beautiful. The views of the city and mountains are gorgeous. Take a look below. There are places to sit and relax while enjoying the views, along with a short educational path where you can learn some new facts about each planet. At night, you can take in the views of the starry skies & city lights.

Beautiful views of Flagstaff's mountains from the Lowell Observatory

The telescope used to discover Pluto

During your visit, you will have the opportunity to take a look at the telescope which was used back in 1930 by Clyde Tombaugh to discover Pluto.

The Pluto Discovery telecope at Flagstaff's Lowell Observatory


During a special Pluto-Palooza event to commemorate the first photos of Pluto, we had the opportunity to take part in a special celebration which included speeches, an interesting liquid nitrogen presentation, telescope viewing, and a viewing of Pluto on a large screen. It was an interesting event to attend, especially for those interested in astronomy. The staff seemed to be very excited and provided very enthusiastic & detailed presentations. The Pluto & NASA’s New Horizons presentation as well as the Cosmic Zoom were both very interesting.

The celebration was over NASA’s New Horizon probe obtaining images of Pluto after being launched 9 years prior. These images were taken over 3 billion miles away. The high resolution photos (which we got to view during our visit), have enabled scientists to see what Pluto actually looks like, as opposed to just guessing in the past. These photos, which were taken 7750 miles above the surface of Pluto were captured on July 13th, and are considered an amazing milestone in the astronomy field.

Other notable discoveries at Lowell besides Pluto include:

*Co-discovery of the rings of Uranus in 1977

*Discovery of the 3 largest stars

*Gyrochronology – determining the age of a star

*Accurate orbits of Pluto’s 2 new moons

*Pluto’s atmosphere

…and many more


The McAllister telescope is used exclusively for public viewing.

The McAllister telescope dome at Flagstaff's Lowell Observatory

The Discovery Channel Telescope, a 4.3 meter, $53 million dollar telescope, is the 5th largest in the world. It is located 40 miles Southwest of Flagstaff in Happy Jack.

The Clark Refractor, which recently underwent renovations, is a 24 inch refracting telescope built in 1895, originally used by Lowell to research intelligent life on Mars. Today it is used mainly for educational purposes.

There are 4 telescopes at the Anderson Mesa research location, just 10 miles Southeast of Flagstaff. The 72 inch Perkins telescope, the 110 inch John S. Hall telescope, the 31 inch NURO telescope, and the Navy Precision Optical Interferometer are amongst those found here.

Rotunda Museum

The Rotunda Museum houses several displays including one detailing the discovery of Pluto in 1930, Lowell’s importance in mapping the moon for the Apollo program, Percival Lowell’s extensive research on Mars, V.M. Slipher’s discovery that our universe is expanding, and a history of the Lowell family. The Cosmic Zoom presentation takes place here. The museum is open for nightly shows and daytime tours.

Things to do during your visit

*Solar Viewing – From 12:30pm-dusk, you will be able to view the sun through a special solar telescope.

*Public telescope viewing – On clear evenings, you will get to observe the night skies using the 16 inch McAllister telescope, the Clark Telescope, and/or by way of portable telescope set up in front of the Rotunda Museum. You can also view objects during the day at the McAllister Dome from 10am-5pm.

*Story of Pluto tours – At 2:30, 3:30, & 4:30, a Pluto tour is offered. Learn more about Clyde Tombaugh and the discovery of Pluto.

*Lowell tours – See the telescope used to discover Pluto. Tours offered at 1:15, 2:15 & 3:15.

*Colors of the Cosmos – Family friendly experiments using light and fire in the Giclas Lecture Hall in the Steele Visitor Center (6pm daily).

*Constellation Tours – Tips and tricks for spotting constellations. 9pm (also 9:30 on weekends).

*The Pluto Walk – A 350 foot outdoor walk where you will learn more about our solar system and enjoy the peaceful, beautiful grounds.

Overall, a trip to the Lowell Observatory is a worthwhile option for those interested in space/astronomy who are visiting or passing through the Flagstaff area. The presentations are interesting & educational, the grounds are beautiful, and having the opportunity to look through a telescope is always an interesting experience.

Directions & Admission

The Lowell Observatory is located at: 1400 West Mars Hill Road Flagstaff, Arizona. Hours are 10am-10pm (Sunday until 5) year round.

Prices are $29 per adult, $26 for seniors, $17 for ages 5-17.