Space travel by LightSail relies on thin, lightweight reflective sails, powered by the sun. First the May launch, then a second launch planned for 2016.
When our sun and planets were born, the Kepler-444 system was already older than our solar system is now.
A panoramic view of the desert world next door, from one of the highest elevations reached by the Mars rover Opportunity in its 11 years on the Red Planet.
Radar images of asteroid 2004 BL86 confirm the primary asteroid is 1,100 feet (325 meters) across with a small moon 230 feet (70 meters) across.
Asteroid 2004 BL86 came closer than any known asteroid this large until 2027. Information and photos of the asteroid, plus links to more.
Scientists publish a slew of science results from the Rosetta comet mission. Among the most fascinating … a crack in the comet’s neck! Plus dust and jets, the mysterious double-lobed shape, and more.
Two photos from the Rosetta spacecraft – one from last November, and one from a few days ago – show a comet’s seasons changing.
Scientific literature cites 50 to 100 light-years as the closest safe distance between Earth and a supernova.
In theory, our home galaxy Milky Way could be a wormhole – a galactic transport system – says a team of astrophysicists.
Uranus, like Earth, has four seasons. But that’s where the similarity ends. For starters, each season on Uranus lasts 21 (Earth) years.
Three moon shadows at once on Jupiter Friday night! It won’t happen again for U.S. observers until the year 2032. You can also watch online.
This ghostly puff of smoke is actually a huge mass of swirling gas and cloud at planet Venus’ south pole, as seen by ESA’s Venus Express spacecraft.
Dawn spacecraft now closing in on dwarf planet Ceres. Image is for navigation purposes; next one due late January. And what is that white spot, anyway?
Fly-through video of the largest image ever taken, of the Andromeda galaxy, nearest spiral galaxy to our Milky Way. Prepare to feel small!
Eta Carinae is a double system containing the most luminous and massive star within 10,000 light-years.
It’s very cool. Hear the sounds of space exploration history!
Astronomers announced this week that – for the first time – they have observed a so-called ‘fast radio burst’ in real time.
The Beagle 2 Lander, built by the U.K., and thought lost on Mars since 2003, has now been found in images from NASA’s Mars Reconnaissance Orbiter.
New calculations by astronomers in Spain and the UK suggest that not one, but two unknown planets might exist in our solar system, beyond Pluto’s orbit.
How to see Comet C/2014 Q2 Lovejoy – still visible through binoculars and telescopes. Finder charts and best photos!
An alarm indicated a possible leak of toxic ammonia. Astronauts evacuated the U.S. side of the station. Later, NASA said the problem might have been a faulty sensor.