STEREO Solar Mission News

STEREO was launched 20 years ago! Check out this interview with Richard Harrison about the purpose, history, and accomplishments of the 20-year STEREO mission.

Twenty years ago, NASA launched a groundbreaking mission to explore the Sun in ways never tried before. 

Using a new technique developed on STEREO data, scientists successfully pinpointed the origin of a record-breaking 19-day solar radio burst to a helmet streamer in the Sun's atmosphere. Combining data from four satellites (STEREO, Parker...

STEREO-A's Heliospheric Imager (HI-2) recently captured a stunning tail disconnection event in comet C/2025 R3 (PANSTARRS). The comet is expected to remain visible to the spacecraft for several more days. ETA: A longer movie, showing...

STEREO-A observed interstellar comet 3I/ATLAS from Sept. 11 to Oct. 2. STEREO is part of a fleet of NASA spacecraft observing this comet, together providing more information about its size, physical properties, and chemical makeup.

On April 7th, 2025, the planet Mercury passed between the Sun and the STEREO Ahead spacecraft, casting a shadow onto the telescopes on board. This planetary transit was not visible from Earth. A movie showing...

STEREO is now posting summaries of select papers written using STEREO data. These are written on a level for general scientists. Interested in how STEREO data is used? Take a look at: https://stereo-ssc.nascom.nasa.gov/publications/nuggets.shtml

April 17, 2021, was a day like any other day on the Sun, until a brilliant flash erupted and an enormous cloud of solar material billowed away from our star. Such outbursts from the Sun...

The recently discovered Comet Nishimura, which has been getting a lot of attention lately, is now visible in STEREO's inner Heliospheric Imager (HI-1) field-of-view. The comet first appeared in the STEREO images on September 17,...

When the STEREO mission was first launched in 2006, with the Ahead and Behind spacecraft each put into their own orbits about the Sun, they soon reached a point where the views from the two...