The solar storms that cause blackouts and damage satelites have always been hard to predict, but two new methods of monitoring them could lead to much more accurate forecasts.
NASA launches Juno, its newest planetary explorer, on a 1.7 billion-mile, five-year voyage to Jupiter. Scientists hope to pierce Jupiter's cloudy veil and fill in the blanks on the origins of the oldest planet.
Jupiter, perhaps more than any object in the solar system, is thought to hold the key to understanding planet formation. On Friday, NASA sends the Juno spacecraft hurtling toward Jupiter to probe the planet's constituent parts.
Pluto moon: The tiny new moon — announced July 20 and called P4 for now — brings the number of known Pluto satellites to four.
Satellite Cassini flew through geyser plumes spouting from Enceladus and gathered ice crystals. These crystals are salt-rich, suggesting that a hidden salty sea lurks beneath Enceladus's icy cap.
NASA's once-iconic astronaut corps will shrink but still play a vital role as the space shuttle era comes to an end.
Alien fossils have been discovered in meteorites from outer space, claims a NASA astrobiologist. Other scientists are urging caution.
New calculations indicate that Pluto might be the largest object in the outer solar system. Does it now deserve to be called a planet again?