"For now, I think the only thing we can do, " said Lunine, " is misquote Shakespeare and say there are more kinds of Earth's and heavens than we can imagine in our philosophies ."
22.
On the other hand, Jonathan Lunine has argued that any living things in Titan's cryogenic hydrocarbon lakes would need to be so different chemically from Earth life that it would not be possible for one to be the ancestor of the other.
23.
"I am personally disappointed that we were unable to get first crack at it, but I hold my colleagues there ( at ASU ) in high regard, " said Jonathan Lunine, a professor in the UA Lunar and Planetary Laboratory.
24.
Pluto Express, a spacecraft proposed for launch in 2004, would swoop past Pluto and could determine if the outermost planet really qualifies as a planet, or-- as many astronomers suspect-- is just another leftover given the boot by Neptune as it tidied up its neighborhood, Lunine said.
25.
Jonathan Lunine, a planetary scientist at the University of Arizona, said that such opening and closing of cracks all over Europa's surface could let enough sunlight through to the water below to provide a source of energy that could produce organic chemicals, and perhaps even life itself, in those depths.
26.
"We don't yet know how life began on Earth, " said Dr . Jonathan Lunine, a planetary scientist at the University of Arizona in Tucson, but Titan " may constitute a natural laboratory for replaying some of the steps that led to life on Earth ."
27.
"The specific pattern they find is puzzling, " said Dr . Jonathan I . Lunine, a professor of planetary science at the University of Arizona, " and it seems to require that the planetesimals that carried these materials into Jupiter came from very, very cold regions ."
28.
That geological activity, Lunine said, might actually be vulcanism-- not the kind of volcanic activity like Earth's, with its eruptions and flows of searing hot lava-- but rather of water thrust up from the interior in the form of slush kept semiliquid by some kind of chemical antifreeze.
29.
Elachi said that the Halloween cat in the radar image looked " similar to a lake on Earth, except you can't drink the liquid . " Dr . Jonathan Lunine, a planetary scientist at the University of Arizona, noted, " How much of the surface is liquid and how much solid is still unclear ."
30.
From all the images and radar observations sent from Titan to Cassini and relayed to Earth by the antennas of the National Aeronautics and Space Administration's Deep Space Network, Lunine and Elachi agreed, it appears that at least in the areas where the observations have been made so far, the terrain of Titan seems to be mainly flat, varying by no more than 50 yards or so.
