Not long ago, the smug learned denigrated the credulous for fearing aliens, UFOs, and the like might be real, arguing that planets that could support life were so rare Earth might actually be unique and, in any case, interstellar distances are so great that the absolute limit of light speed on the travel of anything at all makes space travel outside individual planetary systems wildly impracticable.
And then some of the planet's biggest brains began to warn SETI supporters should be more careful what they wished for, as anything out there that might actually come for a visit would more likely want to eat us than aid us.
October 1, 2015
War of the Worlds, Independence Day, Invaders from Mars…
The idea of advanced alien creatures targeting our world for conquest has long been the stuff of science fiction.
But this fantasy could become fact, warns famed physicist Stephen Hawking.
“If aliens visit us, the outcome could be much like when Columbus landed in America, which didn’t turn out well for the Native Americans,” Professor Hawking recently told El País.
“Such advanced aliens would perhaps become nomads, looking to conquer and colonize whatever planets they can reach,” he continued.
The Avatar scenario.
Anyway, how do they get here?
Scientists in general still think interstellar distances are prohibitive.
And why the hell are we sending people to Mars?
There is nothing men can do in space that robots and computers can't do better and a lot more cheaply.
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