National Aeronautics and Space Administration
Goddard Space Flight Center
Sun-Earth Day 2009: Our Sun Yours to Discover
IMAGE GALLERY
- STEREO (Behind) - December 16-17, 2007
STEREO (Behind) observed in profile the bending and twisting loops above an active region as it rotates to and around the edge of the Sun over two days in EUVI 171 wavelength (Dec. 16-17, 2007).
NASA Fact
Some sunspots are cool enough that water vapor can form at a temperature of 1,550 °C.
- NASA Official: Dr. James Thieman
- Curator: Bryan Stephenson