“Every time there is a major impact on Europa, a vast quantity of water will be splashed from the ocean into the space around Jupiter. The water will partly evaporate and partly condense into snow. Any creatures living in the water not too close to the impact will have a chance of being splashed intact into space with the water and quickly freeze-dried. Therefore, the easy way to look for evidence of life in the Europa ocean is to look for freeze-dried fish.” Text: Freeman J. Dyson, “The Sun, The Genome, and The Internet.” Oxford University Press, New York, 1999, p.81. Image: Mosaic of Europa’s Ridges, Craters. “This view of the icy surface of Jupiter’s moon, Europa, is a mosaic of two pictures taken by the Solid State Imaging system on board the Galileo spacecraft during a close flyby of Europa on February 20, 1997. The pictures were taken from a distance of 2,000 kilometers (1,240 miles). The area shown is about 14 kilometers by 17 kilometers, with a resolution of 20 meters per pixel. One of the youngest features seen in this area is the double ridge cutting across the picture from lower left to the upper right. This double ridge is about 2.6 kilometers wide and stands some 300 meters high. Small craters are most easily seen in the smooth deposits along the south margin of the prominent double ridge, and in the rugged ridged terrain farther south. The complexly ridged terrain seen here shows that parts of the icy crust of Europa have been modified by intense faulting and disruption, driven by energy from the planet’s interior.” Image and text: Jet Propulsion Laboratory, CalTech, Pasadena.