Fact Sheet

SOHO (SOlar Heliospheric Observatory) is a space-based observatory, viewing and investigating the Sun from its deep core, through its outer atmosphere - the corona - and the domain of the solar wind, out to a distance ten times beyond the Earth's orbit.

News

News

Earth's atmosphere stretches out to the Moon – and beyond
20 February 2019The outermost part of our planet's atmosphere extends well beyond the lunar orbit – almost twice the distance to the Moon.
Tracking a solar eruption through the Solar System
15 August 2017Ten spacecraft, from ESA's Venus Express to NASA's Voyager-2, felt the effect of a solar eruption as it washed through the Solar System while three other satellites watched, providing a unique perspective on this space weather event.
Gravity waves detected in Sun's interior reveal rapidly rotating core
1 August 2017Scientists using the ESA/NASA SOHO solar observatory have found long-sought gravity modes of seismic vibration that imply the Sun's core is rotating four times faster than its surface.
SOHO celebrates 20 years of discoveries
2 December 2015Originally planned for a two-year mission, the ESA–NASA Solar and Heliospheric Observatory, SOHO, is today celebrating two decades of scientific discovery.

Latest Announcements

Latest Announcements

SOHO views Mercury's transit of the Sun - 9 May 2016
9 May 2016Skywatchers throughout most of the world can today catch a glimpse of Mercury as it passes between Earth and the Sun in a rare astronomical event known as a planetary transit. Mercury will appear as a tiny black dot as it glides in front of the Sun's blazing disc over a period of seven and a half hours. The ESA/NASA SOHO spacecraft will see the...