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It's a very big leap, a huge effin leap, a ginormously unbelievable leap, to think that because there are theoretically habitable planets that sentient life would evolve. Rein it in a little. We may be amoebas in a swarm of interstellar life, but we don't know that as of now.
It's very cool that there are other planets that may be conducive to life.
Pure science is beneficial to us. The import may not be clear yet, but things like encouraging others to pursue sciences pure and applied, the gains in technology and analysis, and potential tangents for the research are all benefits.
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