The Juice spacecraft will try to get off Earth after being held back because of lightning concerns.
The European Space Agency will make another attempt on Friday to launch its Jupiter Icy Moons Explorer .Juice is being sent to the largest planet in the Solar System to study its major moons - Callisto, Ganymede and Europa - which are all thought to retain vast reservoirs of liquid water.This might sound fanciful. Jupiter is in the cold, outer reaches of the Solar System, far from the Sun and receiving just one twenty-fifth of the light falling on Earth.
"That depth of ocean is 10 times that of the deepest ocean on Earth, and the ocean is in contact, we think, with a rocky floor. So that provides a scenario where there is mixing and some interesting chemistry," the researcher told BBC News.Lift-off for the six-tonne Juice spacecraft has been scheduled for 09:14 local time in Kourou .
Ariane doesn't have the heft to send Juice direct to its destination, at least not in a useful timeframe. Radar will be used to see into the moons; lidar, a laser measurement device, will be used to create 3D maps of their surfaces; magnetometers will explore their intricate electrical and magnetic environments; and other sensors will collect data on the whirling particles that surround the moons. Cameras, of course, will send back countless pictures.
Already scientists are thinking about how they could put landers on one of Jupiter's frozen moons to drill through its crust to the water beneath.
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