This image was captured from the ISS (International Space Station) in 2003. It shows the Pacific Ocean with a towering thunderstorm cloud. You can also see how thin the Earth's atmosphere is compared to its diameter! It has been released by NASA on the occasion of Sun-Earth Day 2008. NASA states:
"Sun-Earth Day is comprised of a series of programs and events that occur throughout the year culminating with a celebration on or near the Spring Equinox. Each year we wrap a fresh new thematic approach around Sun-Earth science while highlighting Sun-Earth Connection scientists, their missions, and research."
More information about Sun-Earth Day can be found directly on NASA's website: http://sunearthday.nasa.gov.