Latest The Blue Marble Stories
Thirty-two have been called, but which will be chosen? NASA's Earth Observatory is hosting the second annual Tournament Earth, a reader-driven competition to choose the previous year's top NASA image of our planet.
The Suomi NPP satellite is in a polar orbit around Earth at an altitude of 512 miles (about 824 kilometers), but the perspective of the new Eastern hemisphere 'Blue Marble' is from 7,918 miles (about 12,743 kilometers).
Forty years ago, Apollo astronauts set out on a daring adventure to explore the Moon. They ended up discovering their own planet.
Internet users can now take virtual 3-D trips to nearly anyplace on the moon, thanks to a NASA program first designed to show aerial views of the Earth.
- In medieval musical notation, a sign or neume denoting a shake or trill.