He said 186,000 mph. Mph = miles per hour.
I don't think you get it. Life forms of earth (The only ones that are known at the moment) require oxygen, etc to live, and the ozone layer to survive. On the other planets, we don't know for a fact that they share our necessities for life.
On another planet, we may not know it, but there may be some sort of life forms that have UV radiation as we have oxygen, and they might use it in the same way.
Rules of earth don't apply to all of the galaxy (or universe) if we don't know much about it.

