You can always tell that these scientists are honestly trying real, real hard to figure things out. Of course, as a Contactee, I have to shake my head, because they are sooooo out of the loop
Why are they assuming that Life only develops on planets like ours? On our planet there are thriving life forms in some very extreme regions, like at the bottom of the oceans. That ought to be a clue that Life will develop on any planet, but it will be life suited for the conditions there. It doesn't even have to be carbon-based life, since we have lifeforms on Earth which aren't carbon based
I wonder why they are concerned about exposure to cosmic rays? There's simply not much of anything you can do about them, and they are known not to be harmful. X-rays and Gamma rays, etc are harmful, and that is what you'd want to shield yourself from