Helioviewer is a solar data browser. You can browse and compare images of the sun at different times, at different wavelengths, and at different magnifications.
NASA's mission is to pioneer the future in space exploration, scientific discovery and aeronautics research. Subscribe to the YouTube channel and watch the latest videos as NASA explores space and discovers Earth.
Check out Sky & Telescope's weekly observing update, Sky at a Glance, published every Friday. Keep up to date on the latest celestial events, and view the sky maps and observing tips.
On February 20, 1962, John Glenn piloted the Mercury-Atlas 6 "Friendship 7" spacecraft on the first manned orbital mission of the United States. Launched from Cape Canaveral (Florida) Launch Complex 14, he completed a successful three-orbit mission around the earth, reaching a maximum altitude (apogee) of approximately 162 statute miles and an orbital velocity of approximately 17,500 miles per hour. Glenn's "Friendship 7" Mercury spacecraft landed approximately 800 miles southeast of Cape Canaveral in the vicinity of Grand Turk Island. His flight on Friendship 7 on Feb. 20, 1962, showed the world that America was a serious contender in the space race with the Soviet Union. It also made Glenn an instant hero.
This site hosted by NASA contains biographical information, photos, and videos about astronaut, former Marine, and former Senator John Glenn, who passed away December 8, 2016.
NASA's Eyes is a way for you to learn about your home planet, our solar system, the universe beyond and the spacecraft exploring them. With applications for Mac and PC as well as apps for mobile devices there are many ways for you to follow along with NASA's scientists and engineers.
This interactive site from NASA introduces the properties of black holes. You can travel to and into a black hole and see what happens to certain objects when they cross the event horizon. Many exercises to help illustrate the text are provided.
Space Engine is a free space simulation program that lets you explore the universe in three dimensions, from planet Earth to the most distant galaxies. Areas of the known universe are represented using actual astronomical data, while regions uncharted by astronomy are generated procedurally. Millions of galaxies, trillions of stars, countless planets -- all available for exploration. You can land any planet, moon or asteroid and watch alien landscapes and celestial phenomena. You can even pilot starships and atmospheric shuttles.