Sounds like a meteorite or similar entity crashing to earth.
While we are the topic of UFOs, I have a theory about them.
Let start of with a little history, and we are going on the theory of evolution (no religious debates please).
If you look at the evolution of mankind and the skulls that have been found of the 'ape' man, you'll see that the very back of the head was somewhat flat while the mouth stuck out...think of Homer Simpson
This is early man....as things evolve, we see him become more upright. His head kind of rounds out in the back. the jaw moves inward. His limbs that were once very bulky have thinned out. His intelligence increases and goes from scraping knuckles to building structures to building aircraft to building space stations. Think of how much science has evolved just this century alone.
That leaves us with our current 'ape-man'
Sorry, I couldn't resist. But do you see what I'm referring to in the shape of the human body throughout evolution?
OK, now imagine where we are going. The head continues to expand and become even more bulbous. The limbs continue to get thinner as mankind becomes more efficient and isn't as laborous as his ancestors once were. Through the generations, the limbs continue to get skinner...he stands even more upright, and the changes in the head and skull continue. Mouth continues inward and the back of the head continues outward. Imagine the evolution of the sun. Its not quite as bright as it used to be...our eyes get a little bigger.....a little darker to soak up the available light.
Think of what science has done in the past 100 years, imagine what it can do in the next million years. Could science develop so far as to make time travel possible?
Folks, I give you the future man:
The aliens we see today are just humans that have evolved...just as we went from the ape-man to today......
The craft you see are actually time machines. This is why witnesses say that they hovered in one spot and then moved at incredible speeds and then just disappeared in a flash of light. What you are seeing is a craft that accelerates to the speed of light, and if Einstein were correct, time travel would be possible. Witnesses are seeing this happen.
Abductees say they are driving down the road and its 3:08 am on their radio. Something happens...they have a vague memory of some sort of abduction...their clock now says 2:58 am....Hmmmm
I saw an interview with two women who were alledgedly abducted. They left somewhere at around midnight. Their destination was 45 minutes away. On their journey, something strange happens with a lot of lights and a spacecraft. They aren't sure what. They think its still been 45 minutes to their destination but they realize that the sun is now rising. Their 45 minute trip has taken them 6 hours...and they only feel like they've been driving for 45 minutes.
Abductees say the aliens do not say anything, but communicate with some sort of telepathy. Could it be possible that this form of communication is possible through evolution. The apeman when to 'ooga-booga' to 'Hello...how are you today...would you like fries with that?' Could it be possible that our communications can evolve to the point we speak by thinking?
Looking through History, it appears that UFO's have made appearances for hundreds (if not thousands) of years. Its said that pictures of UFO's can be found throughout ancient history...from the Pyramids to Native Americans of just a few centuries ago. These craft don't seem to change shape throughout the thousands of years...Why is that? Its the same form of craft from the future. If I had a Time Machine, could I interest you in a trip back to look at the Pyramids? Perhaps you would want to go visit the Aztecs? Perhaps you'd want to go see how the 'real' native americans were before the settlers arrived? Maybe you would want to see the current Dallas Texas sometime....or any other part of the world (ufos seem to make appearances worldwide).
So folks, those aren't aliens coming to see you...but your great (x100) George stopping in to say 'Hello'.........