Galileo
Photos: Ariane 5 rocket rolls to launch with four Galileo satellites
An Ariane 5 rocket emerged from its vertical assembly building Monday and rolled along dual rail tracks for a 1.7-mile (2.7-kilometer) journey to its launch pad at the Guiana Space Center on the northern coastline of South America, moving into position for blastoff Wednesday with four Galileo navigation satellites.
Water plumes on Europa detected by Galileo spacecraft
A review of data captured by NASA’s Galileo spacecraft as it orbited Jupiter in the 1990s indicates it likely flew through a plume of water vapor spewing from cracks in the surface of the moon Europa, providing independent evidence water is being released from a vast sub-surface ocean beneath its frozen crust, scientists said Monday.