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Old February 23rd, 2017, 04:13 PM   #41
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A bit of trivia, to be able to view dinosaurs on Earth from 65 million light years away would require a lens over four light years in diameter or 25.9 trillion miles.
With our technology that doesn't mean another civilization could not do i with ease.
Fail.
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Old February 23rd, 2017, 04:21 PM   #42
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One question I have is: If this system has planets very close to its sun, and the sun was very hot and has since cooled off a whole hell of a lot, did all the water boil off into space in past eons?

If so life as we know it would be impossible.

It's very possible...perhaps more than likely even, that it never had water in the first place! Cause when these stories of extra-solar planets come up, they make no distinction between having liquid water or being in the temperature range necessary for liquid water.

According to astrophysicists, the rocky planets in our solar system - mercury, venus, earth and mars, would have had very little water early on, and it was during that early period of massive bombardments from asteroids and comets from the outer reaches of the solar system, that Earth received most of the water to form the planet's oceans. So, it's another example of luck or good fortune being necessary to provide the conditions necessary to support life on Earth. A smaller solar system, and even a larger one without the right mix, might not be so lucky.
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Old February 23rd, 2017, 06:07 PM   #43
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It is the same human arrogance that says man is made in gods image that thinks life outside our sphere would resemble ours in any way.
Well, yes and no. Yes, intelligent life could take any form, but for sure our "model" is a pretty good one. Well designed, but of course made of matter and thus inherently flawed.

They might resemble us, or maybe we resemble them, or maybe we are them and they are us. Maybe.
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Old February 24th, 2017, 01:37 PM   #44
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A bit of trivia, to be able to view dinosaurs on Earth from 65 million light years away would require a lens over four light years in diameter or 25.9 trillion miles.
Yes, a lens as we understand them.
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Old February 25th, 2017, 05:17 AM   #45
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Yes, Newton's Law of Universal gravitation also tells us that the gravitational force (or pull) between two bodies (like planets) is proportional to the product of their masses, and inversely proportional to the distance separating them.

Also yes, I am indeed a high school physics teacher.
Mr. Tackett was my High School physics teacher and he was an excellent teacher. Mr. Tackett had a compulsion to make the boys tuck their shirt tails in everywhere he saw a shirt tail pulled out including hallways, etc.

High School physics class was where I was introduced to Ohm, Newton and Bohr.
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Old February 25th, 2017, 05:54 AM   #46
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Yes, a lens as we understand them.
Optics was never my forte but the missile fire control radar had a truncated paraboloid transmitting and receiving antenna. The focal length was app. 1500 feet and diameter of the dish was 13 feet.

I wonder what the focal length would be with a 4 light year diameter parabolic antenna to see back 65 million years and watch dinosaurs walking around?

Last edited by imaginethat; February 25th, 2017 at 07:15 AM.
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Old February 25th, 2017, 12:21 PM   #47
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I don't give any more credit to this stuff than I do the multiverse, the holographic universe or ancient aliens
you don't believe the guy with the crazy hair on ancient aliens??
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Old February 26th, 2017, 10:25 AM   #48
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39.
The exoplanets circle the star TRAPPIST-1, which lies just 39 light-years from Earth a mere stone's throw in the cosmic scheme of things.
We couldn't detect planets around a star 39 million light years away.
39 million light years wouldn't even be in the Milky Way Galaxy. The Milky Way is only 100,000 light years in diameter.

We wouldn't be able to detect a single Red Dwarf star at that distance let alone any planets that might orbit it
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