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SOHO was launched on 2 December 1995, for what was originally planned as a two-year mission. Twenty years later, it's still going strong.



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SOHO is featured in the Astronomy Picture of the Day.



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We are pleased to announce the winner and runner-ups in our SOHO 3000th comet contest. The entries had to guess the time and date of perihelion (closest approach to the Sun) of our 3000th comet...

On Sept. 13, 2015, the Solar and Heliospheric Observatory -- a joint project of the European Space Agency and NASA -- discovered its 3,000th comet, cementing its standing as the greatest comet finder...

The Solar and Heliospheric Observatory (SOHO) has been watching the Sun for almost 20 years. In that time it has seen solar activity ramp up and...



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An elongated solar filament that extended almost half the Sun's visible hemisphere erupted into space (Apr. 28-29, 2015) in a large burst of bright plasma.



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Most of the energy that generated the most powerful geomagnetic storm of this solar cycle on March 17-18, 2015 came from this fast-moving, Earth-directed coronal mass ejection (CME)



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On March 20, 2015 a solar eclipse raced across the northern Atlantic between Ireland and Iceland before hitting land...



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SOHO is approaching the date when its images will reveal its 3000th comet, a record-extending achievement. So we are offering everyone an opportunity to guess when this will happen...



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An unusual comet is skirting past the Sun (Feb.18-20, 2015). "It's a 'non-group comet,' meaning that it does not appear to be related to any other comet or comet family that we have on record,"...

The Sun blew out a powerful coronal mass ejection (CME) from just around the edge of the Sun...



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An active region just about squarely facing Earth erupted with an X 1.6 flare (largest class) as well as a coronal mass ejection (CME)...



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A far-side powerful flare erupted and triggered a huge and long-lasting proton storm that flew...



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STEREO (Behind) captured this magnificent coronal mass ejection (associated with an M-class flare) that flung a long stream of plasma...



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At their closest approach, these two bright planets, Mercury and Jupiter, were less than



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The Sun unleashed two bursts of plasma over a two-day period...



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STEREO has observed the recently discovered Comet Jacques as it passed by its nearest approach to the Sun



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A single active region on the Sun ejected at least half a dozen bursts of plasma...



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The Sun unleashed two bursts of plasma over a two-day period...



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The dynamism of the Sun was readily apparent for five days in the past week: it blasted at least eight substantial coronal mass ejections...



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