Can't say for sure...but in the 70's out at sea star gazing I watched an unknown light that was definitely not a star or typical man made aircraft zoom all the way across the sky, stop and zip across the other direction at an upward angle, stop and do the same again, then disappear almost straight up all in about 4 or 5 seconds. Too far away to make out any detail, just a point of light. Stars don't move around. Comets don't move that fast. Nothing made by man can maneuver like that. Planes usually just go across the sky in a straight line and take several minutes to cross. This thing went 3/4 across the sky in less than 2 seconds. UFO? Probably but can't really say, no detail at all, just a point of light pretty far away. No sound.
Several years ago looking around with my telescope, not looking through it but looking around for something else I might want to look at, a light in otherwise empty sky blinked 3 times and that was it. No movement, no planes visible, no sound. ??? No street lights straight up, closest one several blocks away.
Extraterrestrial life, very good possibility. With billions of stars in this galaxy alone and billions of galaxies, hundreds of planets already located, I consider it very unlikely we are the only life in the universe, or even this galaxy. If both carbon and water can be found on asteroids and other space objects, and those are the two main requirements for the potential for life in some form, what are the chances other planets elsewhere have not been around long enough and subjected to the same forms of energy from their local stars, might also have formed life?
Not sure what to think of Hawking's comments, but he may be right. If another form of life has figured out how to get here, which we can't do, they are obviously more advanced than we are, and should be approached with caution. The one flaw in his logic is that he figures any intelligent life will naturally follow the same social and psycological course as humans. Conquest would likely be their goal. Not necessarily. It does merit consideration though.
On the other hand, I would also have to consider the possibility that another form of intelligent life might follow an entirely different course, or maybe have moved beyond the level of current human mindset, and prefer to be peaceful.
There are stories and legends all over the planet from various societies that tell of visitors from the stars helping their remote ancestors, and in some cases considered Gods. Depictions in stone of humanoid beings wearing what can only be described as helmets and possibly some form of breathing apparatus...space suits. Many of these places have huge blocks of stone weighing up to 120 tons that have been mined and moved from as far as 25 miles to their current locations, and apparently shaped by some means so they fit together so well you can't fit a business card between two of them. We don't have the ability to do that today. No mechanical device currently in existence can lift a 80 ton slab of granite and place it on top of another one 20 feet or more high. The only means we have of even shaping it would take a very long time.
Conventional archaeology says these stones were worked using rock and/or copper tools. So why have no such tools been found at most of these locations? Stone architecture has been found that is estimated to be over 10,000 years old in some cases, some of it so precise one stone laid on top of another would actually form a vaccuum. Stone sarcophagi in Egypt polished to a near mirror finish. The inside surface of the lid worked to perfect right angles. Not just close...and they were supposed to be able to do all that with stone and copper tools, laying it all out with pieces of string???
Lines on the Nazca plains laid out in perfect straight lines for several miles. A toy replica that can only be called an airplane was found I think in South America. A researcher in this field built a scale replica with a wingspan of about 2 feet, added an electric motor and some controls, it flew with no problems at all. I saw that on a documentary a while back, they filmed the first flight. And this toy was thousands of years old, only a few inches long.
It's incredibly interesting, and many of these places have been considered by local natives to be holy places inhabited by Gods long ago. I've been reading books on it for many years.
One of these is Tiahuanaco. Estimated by some to be as much as 14,000 years old, at 4000 meters above sea level. That's around 12,000 feet give or take a little.
http://www.ancient-origins.net/news-his ... via-020278Puma Punku is another one, and take a look at the links toward the top of that site for others. Just the row of heads at Tiahunaco representing many different races is cause for consideration...