NASA discovery: 1 star, 7 planets, multiple in habitable zone. How would this affect life on the planets?

I have left a link to the NASA video in case you are not to sure what I am referring to or to get a better picture of what I am talking about.

With that in mind, I imagine that some of these planets if not all would be capable of having sentient life.

Question: How would these sentient species play a role on each other's evolution/growth?

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NASA discovery: 1 star, 7 planets, multiple in habitable zone. How would this affect life on the planets?

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