I think other intelligent life forms are out there and I think it is possible they might have stopped by. Frequently or thousands or millions of years ago, through space, other dimensions or other methods we haven't figured out yet, I think it is very possible they could have been here or are here currently.
Things I consider:
1. Lifespan. A mayfly only lives 24 hours which would make our life spans seem like an eternity to them. For example, our 74 years (est) life expectancy x 365 days = 27,010 mayfly lifetimes. If there was a life form out there that had the same relation to us then one lifetime for them would be almost two million years for us. If we lived for two million years then our perception of how long it takes to travel around space might not be as overwhelming or unrealistic.
2. Our understanding of what is possible with speed. Just because our current understanding of speed puts a limit on it doesn't mean there is a speed limit. It just means we don't know how to go faster. I haven't followed up on it but I read recently a group of scientists might have surpassed the speed of light.
3. Our understanding of space and technology. We have theories about worm holes, etc. but if a civilization has been around longer they might have found other methods of travel we don't yet understand. For all we know they can 'beam' to our atmosphere or to a specific location on whatever planet or object in space they choose.
With all of that said, somebody has to be the first. I just don't think it is us.
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