Bigfoot and Yeti .... nope.
UFOs ...... There are 70 thousand million million million stars in the universe (7 sextillion) and without doubt billions of planets, many of which could sustain life but perhaps not as we know it. Do aliens exist? IMO, yep, they do.
Have we genuinely seen them? Don't know. But consider the distances ....... our nearest star (Proxima Centauri) is 4.7 light years away from us and that's travelling at 186,000 miles per second every minute and every hour and every day. Exoplanets are (around) 50 light years away.
Assuming an alien craft can match the speed of light, I don't see how it's possible they would take the journey unless they have life spans far longer than ours. It would take us (with our technology) thousands (many thousands) of years to get to an exoplanet.
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Maybe the speed of light isn't the fastest form of travel ....... both Hawking & Einstein have proposed how both space & time may be 'warped' and massive distances covered almost instantaneously.
Not so much wormholes as "bending spacetime" to create a singularity, much as you can do with folding a map to jump from London to New York instantaneously. However, this is (very) theoretical physics. That's not to say that something somewhere hasn't done it. Just that we can't right now.Perhaps. Wormholes? Maybe. It's all theory. I won't dismiss it and I won't accept it @moonchip
What I will finish on is that I am convinced we are not alone
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