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Christopher Chyba says that there are two worlds that are showing signs of planetary evolution, which mean possible life signs. The two worlds are Mars and Europa. Some of the major projects going on that are related to Europa. Cynthia Phillips is the leader of one project, Kevin Hand is another, and Max Bernstein, who’s a SETI institute P.I., is the leader of the third project, and Christopher Chyba is as well working on another project. Cynthia Phillips is studying what she calls a “change comparison”. Her experiment goes back to when she was a graduate associate. She looked at surface images of IO from the images of Voyager and compared them to more recent surface images from Galileo in 1990. She is now using this technique on Europa. S