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This graphic shows the difference in the appearance of the Moon’s size in its furthest and closest distances to Earth.

Stargazers can see the final supermoon of the year this weekend

If you miss this supermoon, you won't be able to see the next one until October 2025.
James Webb Space Telescope's MIRI imager shows dust cloud around Vega.

Webb telescope delivers new ideas about Milky Way star Vega

UA-built camera shows vast, smooth dust disk surrounding the star.
Photo of Europa from NASA's Galileo spacecraft, 1998.

New NASA spacecraft ready to launch toward Jupiter moon Europa

Europa Clipper will observe surface features that could conceal a vast ocean.
Artist's illustration of 2024 PT5.

Earth welcomes temporary new moon

Scientists say the traveling companion will only stick around for a few weeks.
This image provided by NASA shows an enhanced color view of Pluto’s big moon Charon captured by the New Horizons spacecraft, July 14, 2015.

NASA's Webb telescope detects traces of carbon dioxide on the surface of Pluto's largest moon

The latest detection is key to studying how Charon and other icy objects in the Kuiper Belt came to be.
An aerial view of Kitt Peak National Observatory. From February 2022.

Kitt Peak celebrates 60 years of public tours

Public telescopes reopen after COVID, fires caused closures on the mountain.
Illustration of the Cassini spacecraft orbiting Saturn.

Cassini orbited Saturn 20 years ago this summer

The robotic explorer made historic discoveries about the ringed planet and its moons.

Remembering the historic Rosetta space flight to a comet 10 years ago

The European-built robotic explorer orbited and landed on the chunk of ice and rock in 2014.

Sky School

The University of Arizona Sky School is an innovative educational program that takes students of all ages to the summit of Mt. Lemmon for a retreat to learn about the ecosystems atop Arizona’s sky islands.
New observations of the Great Red Spot on Jupiter have revealed that the planet’s atmosphere above and around the infamous storm is surprisingly interesting and active. This graphic shows the region observed by Webb — first its location on a NIRCam image of the whole planet (left), and the region itself (right), imaged by Webb’s Near-InfraRed Spectrograph (NIRSpec).

New findings about Jupiter revolve around Great Red Spot

Data from James Webb Space Telescope adds to giant planet's mystery.
Artist's rendering of a protoplanetary disk surrounding a young star.

James Webb Space Telescope looks at planet-forming process

The stellar observatory continues to help scientists develop theories about the universe.
Large Binocular Telescope atop Mt. Graham.

UA telescope grabs ground-breaking images of Jupiter's volcanic moon

The photos are the best Earth-based pictures to reveal lava flows on Io.
12P/Pons–Brooks is a Halley-type periodic comet with an orbital period of 71 years. It was discovered in 1812 and later recovered during passages in 1883 and 1954. It is expected to brighten to an apparent magnitude of 4.5 (visible to the naked eye) during its upcoming passage in April 2024.

The 'devil comet' is visible in the night sky, and is sticking around for the eclipse

A rarely-seen comet with a reputation for colorful flare-ups is once again visible from Earth.
Illustration of VIPER (Volatiles Investigating Polar Exploration Rover) on the moon.

Put your mark on the Moon via new NASA rover mission

The spacecraft is designed to carry names on a microchip.
OSIRIS-REx principal investigator Dante Lauretta at the unveiling of the Bennu sample in Tucson.

Bennu sample goes on display in Tucson

It is older than any rock found on the Earth or the Moon so far.
February 29, 2024

Leap day places calendars back in sync

Scientists say the calendar quirk puts the Earth's rotation and trip around the Sun in the proper order.

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