I know that I'm going to get a lot of flack for this, but I find the notion that extraterrestrial life has visited the earth to be absolutely ridiculous. There probably is intelligent life out there, so I'm not saying that it doesn't exist. However, the nearest star is 4 light years from us, and the nearest star that has planets that might be able to support life is about 12 light years away. Let's assume that the planet does have life, which is a giant assumption as it is. Now, let's assume that the life on the planet evolved into some intelligent form of life. Even still, we must assume that the lifeforms are capable of designing a vehicle that can travel light years across space in a timely manner. Another assumption that we have to make is that the resources to actually construct and fuel such a vehicle are available, else the vehicle can't possibly ever be constructed. We also have to assume that the aliens have a method of keeping the crew on their vehicle alive in the middle of space for a minimum of years without starving to death or running out of stuff to breathe. Another assumption is that such an alien can survive coming out of microgravity despite being it it for years. The last assumption that we have to make is that the aliens are capable of navigating through space without being able to contact their home planet. After all, the time that it takes to send messages to and from a vehicle in space is dependent on the speed of light (constant) and the distance from the home planet (increasing over time). Even if we assume that all of these wildly enormous assumptions are all true, we still haven't considered the amount of kinetic energy that it would take to achieve the fastest speeds possible to travel to the earth. The kinetic energy per unit mass to get close to the speed of light is E/m=((1-v^2/c^2)^(-1/2)-1)c^2. Going from 10 percent to 99.9 percent of the speed of light by increments of 10 percent, the actual values for energy per unit mass are 4.52x10^14 J/kg, 1.85x10^15 J/kg, 4.34x10^15 j/kg, 8.19x10^15 J/kg, 1.39x10^26 J/kg, 2.45x10^16 J/kg, 3.60X10^16 J/kg, 5.99x10^16, 1.16x10^17 J/kg, 1.92x10^18 J/kg, and that's for objects of just one kilogram. Any vehicle capable of space travel will be at least 10000 kg, perhaps even over 100000 kg, so you can do the math as to how much energy that would be. Also, the amount of energy to both speed up the vehicle and to slow it down to come to earth would be double the energy values that I posted.

Now I know that some idiot is going to come along saying something along the lines of, "what if the aliens have some superior technology/energy source that we haven't discovered." To me, that just sounds like a baseless what if scenario that can't be backed up without making the assumption that aliens actually have traveled here, which is make the case the possibility of alien travel a circular argument. Without the assumption that makes the argument necessarily circular, the "what if" scenario that I described is a special pleading fallacy. I also predict that some UFO moron is going to come in with some story about something about some weird shit that they saw, and then make the argument from ignorance fallacy to justify that it was an alien spacecraft. I bet that some fan of that piece of shit show from History Channel is going to show up here peddling the pseudoscience/pseudohistory that's been promoted on the show. If aliens have never been to Earth, then Phil Schneider, as well as the alien shows on History Channel are necessarily full of shit, for obvious reasons. I bet that some conspiracy theorist idiot is going to try to use the death of Schneider, combined with a correlation implies causation fallacy, to try to justify that there was some government cover up, that Schneider was correct, both or more.

BTW, I'm way more likely to respond to private messages than to forum posts, but I'll do my best to respond to things posted here in response to what I said.

Let the shitstorm commence!