Made to last 3 yrs, telescope shoots full 22-yr Sun cycle
The Solar and Heliospheric Observatory (SOHO), operated by NASA and ESA, has captured the Sun's complete 22-year magnetic cycle. Launched in 1995, SOHO was designed to probe the Sun's internal structure and atmosphere for 3 years, but its missions were extended owing to successful studies. Sun's polarity changes every 11 years as the field flips between northern and southern hemispheres.