I personally hope to see at least one planet/moon colonised before I die.
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I'm hoping they find life on Europa or Enceladus before I die. Even better would be an alien signal. All you'd need to "put you hand up" to the galaxy is a planet sized triangle sail orbiting your star. We'd pick up the drop in light and computers can give the measurements on size. Imagine seeing a triangle pass some star out their. No way that's natural.