To travel the thousands of millions of kilometers to reach earth an alien space craft would have to travel at the speed of light for several years. 'IF' & this is a BIG 'if' we could travel at light speed it would take several years of accelleration to safely reach that speed (at a G-force our body could handle) and then take several years to decelerate safely to stop. If they (aliens) could do this, they would be coming here for a reason, not to do a quick light show & fork off. They would most likely seek our resources and would not be discrete in showing their intentions. If they can overcome such scientific challenge's and arrive on our earth we would be in a lot of catastrophic trouble. If we study the simple history of colonisation on earth amoung humans, animals and viruses, when someone moves in on another's territory they usually destroy them, not do a light display and vanish. The problem with many who believe in such things is they have not looked at the issue in its entirety and come to the conclusion without much rational thought.
I never for a second said the possibility of life outside earth does not exist, with the size of the cosmos and the fact that we have life here suggests under the right conditions its entirely possible. My point was that for sensible reason no alien life has come to earth to visit. As far as life in the form of gas....well that's the sort of stuff folks will come up with to support a fairly baseless, fact less argument. I really wish aliens did visit earth and show us crazy stuff, but the facts and evidence is just not there. If they did somehow get here, I promise you you'd get far more than a light show, we would all be in a lot of trouble.
Not to be rude (for I really like you a lot and think you're a great guy), but it's always the ignorant (and arrogant) people who deem themselves smart enough to know what others do or do not know. You were a cop, not a scientist.Not a single person on the face of this sorry planet of ours is qualified to say what must be present for life on another planet to exist. If they do attempt to say so, it's entirely speculation and conjecture.
Not to be rude (for I really like you a lot and think you're a great guy), but it's always the ignorant (and arrogant) people who deem themselves smart enough to know what others do or do not know. You were a cop, not a scientist.
Ah yes, the National Review. Opinion news for the dozen or so remaining neoconservatives too intellectually proud to read Breitbart's dumbed down alternative facts.