Sciencescience

Sat Feb 10, 2018, 09:58 PM

 

How you can know we have not been visited by extraterrestrials:*

They don't know we are here.

Yes, it's that simple. We've only been sending out radio signals for just over 100 years. No signals we have created would have crossed the vast distances required to be received by any existing intelligent species yet.

If you want to claim they might have just ran across us among trillions of solar bodies, well, I'll just have to let you have your point.

*The main point of this OP was supplied by a friend.

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Reply How you can know we have not been visited by extraterrestrials:* (Original post)
Killdozer Feb 2018 OP
buck_turgidson Feb 2018 #1
Killdozer Feb 2018 #2
nolidad Feb 2018 #3
buck_turgidson Feb 2018 #4
Currentsitguy Feb 2018 #29
buck_turgidson Feb 2018 #31
Currentsitguy Feb 2018 #32
buck_turgidson Feb 2018 #33
Currentsitguy Feb 2018 #34
buck_turgidson Feb 2018 #35
Currentsitguy Feb 2018 #36
buck_turgidson Feb 2018 #37
Currentsitguy Feb 2018 #38
buck_turgidson Feb 2018 #39
Currentsitguy Feb 2018 #40
buck_turgidson Feb 2018 #41
Currentsitguy Feb 2018 #42
buck_turgidson Feb 2018 #43
Currentsitguy Feb 2018 #44
buck_turgidson Feb 2018 #45
Currentsitguy Feb 2018 #46
wonderwarthog Feb 2018 #5
Currentsitguy Feb 2018 #30
wonderwarthog Feb 2018 #47
Currentsitguy Feb 2018 #48
fszwfnj Feb 2018 #6
turquoise Feb 2018 #10
Killdozer Feb 2018 #15
RATFINK_5.0 Feb 2018 #7
turquoise Feb 2018 #11
rampartb Feb 2018 #13
DDKick Feb 2018 #8
turquoise Feb 2018 #12
joefriday6 Feb 2018 #9
rampartb Feb 2018 #14
Squeek Mar 2018 #49
Lowrider1984 Feb 2018 #17
joefriday6 Feb 2018 #18
Lowrider1984 Feb 2018 #21
joefriday6 Feb 2018 #22
Lowrider1984 Feb 2018 #23
joefriday6 Feb 2018 #24
def_con5 Feb 2018 #16
oflguy Feb 2018 #19
SatansSon666 Feb 2018 #20
LeeCPTINF Feb 2018 #25
smalllivingeddy Feb 2018 #26
Killdozer Feb 2018 #27
Jake Feb 2018 #28

Response to Killdozer (Original post)

Sat Feb 10, 2018, 10:15 PM

1. We can't absolutely know, but the sheer distance alone makes it awfully hard for them to visit us.

 

Now, maybe this isn't the first time that we have developed this kind of communication technology....say, perhaps 15 or 20 thousand years ago....then maybe they did find us.

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Response to buck_turgidson (Reply #1)

Sat Feb 10, 2018, 10:16 PM

2. I can't answer for a hypothetical.

 

Only what is known.

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Response to buck_turgidson (Reply #1)

Sat Feb 10, 2018, 10:31 PM

3. Distance doesn't make it awfully hard- its impossible

The nearest star is 6 light years away! That's 36 trillion miles we have hit mach 30 or 25k /hour so let us say they can do 10 million miles/hour that would be 394 years!

And if they have light speed and spock on board- why don't we have any evidence other than grainy photos.

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Response to nolidad (Reply #3)

Sat Feb 10, 2018, 10:33 PM

4. the jury is still out on impossible

 

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Response to buck_turgidson (Reply #1)

Wed Feb 28, 2018, 10:18 AM

29. "this isn't the first time"

I highly doubt it. Radio presupposes a technological civilization. Look how quickly things happened after Marconi. We went from horse and buggy to cars and airplanes to jets to nuclear weapons, computers, and landing on the moon in the span of basically one human lifetime.

No, if we had made it that far before, we'd have been to the moon before, and that evidence would still be there, which it isn't.

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Response to Currentsitguy (Reply #29)

Wed Feb 28, 2018, 02:19 PM

31. We may have taken ourselves down sooner in previous times...

 

We developed nuclear and biological weapons before we went to the moon.

...or perhaps there was evidence on the moon that happened to be destroyed by an impact or that we have either missed or that NASA has not publicized.

And before you go all "conspiracy theory" on me with the "not publicized" thing.....Societal shock from finding something like that on the moon would be pretty large....Governments on earth would not take that sort of revelation lightly.

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Response to buck_turgidson (Reply #31)

Wed Feb 28, 2018, 02:33 PM

32. Perhaps...

It seems a bit far-fetched, but anything is within the realm of possibility.

I'm not sure some of the Ancient Indian (India) stories don't describe a bout of advanced warfare, and don't forget there was a construction dig there several years back that hit a layer of fused glass that was only thought to have come from a nuclear detonation.

I'll say this: Evidence now supports homo sapiens in it's modern form being around from somewhere between 200,000 and 500,000 years, depending on who you listen to. Do you mean to tell me we basically sat around with our thumbs up our asses for 99.999% of out time here and only recently, relatively speaking, learned everything from farming, to computers, all in a span of less than 10,000 years? It does stretch credulity.

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Response to Currentsitguy (Reply #32)

Wed Feb 28, 2018, 02:55 PM

33. It isn't as if I am convinced of anything in particular.

 

One theory that I am interested in is the notion that we may have taken a large meteor or comet hit the North American ice sheet about 13,000 years ago.
It did not leave a crater because the ice sheet was 2 miles thick and the meteor struck the earth at an angle which caused crust displacement. The result moved North America into the temperate zone, and moved all of Antarctica into the polar zone.

I am interested in seeing what is under the ice on the Antarctic coastline near South America.











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Response to buck_turgidson (Reply #33)

Wed Feb 28, 2018, 03:04 PM

34. If that were so

There should be a sedimentary layer, like the K/T Boundary.

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Response to Currentsitguy (Reply #34)

Wed Feb 28, 2018, 03:18 PM

35. Some researchers claim that there is such a layer....smaller than the K/T Boundary...

 

it contains iridium, platinum...nanodiamonds
This was a much smaller impact than the one 65 million years ago.

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Response to buck_turgidson (Reply #35)

Wed Feb 28, 2018, 03:31 PM

36. Playing Devil's Advocate

If it were smaller it seems unlikely it was enough to move the Tectonic Plates, and besides, places like the Yellowstone hotspot have been relatively stable in their location, or at least progression. In other words there is no evidence it lurched in any direction in recent history, geologically speaking.

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Response to Currentsitguy (Reply #36)

Wed Feb 28, 2018, 03:42 PM

37. Good point.....also if something did move them....

 

I would hate to find out what happens to a Supervolcano under that circumstance.

I don't have any particular beliefs about pre-history, but I would love it if we discovered evidence of a truly ancient civilization.

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Response to buck_turgidson (Reply #37)

Wed Feb 28, 2018, 05:23 PM

38. I admit to the same visceral desire.

Did you ever back in the day watch "In Search of..." with Leonard Nimoy? Many went off into silly land but a few dealt with stuff such as this.

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Response to Currentsitguy (Reply #38)

Wed Feb 28, 2018, 05:56 PM

39. Yes, I really liked that show....

 

I even like Ancient Aliens, and it isn't that I believe that aliens were involved in our past. They simply go our and find astonishing things from the past.
I believe that humans are incredible and perfectly capable of doing all of the things that they imply must have been done for us by aliens.
Some of the things that were created in our distant past are almost incomprehensible.

the stones of Baalbek,



the Great Pyramid, the ancient examples of core drilling into granite nearby


100 ton granite boxes carved from a single piece of stone


perfectly fitted walls built with enormous stones



I am so impressed with humans. I am surprised we didn't go to the moon sooner.




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Response to buck_turgidson (Reply #39)

Wed Feb 28, 2018, 06:08 PM

40. "I am surprised we didn't go to the moon sooner"

I suspect that had the Roman Empire not fallen into decadence and been replaced with the anti-knowledge Christians of the time, we would have.

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Response to Currentsitguy (Reply #40)

Wed Feb 28, 2018, 06:45 PM

41. have you ever seen Caesar's Messiah?

 

The movie tries a little too hard, but if the filmmaker is correct, even Christianity might be a product of the Romans.

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Response to buck_turgidson (Reply #41)

Wed Feb 28, 2018, 07:23 PM

42. No I have not, but I will

If the subject fascinates you give Roma Eterna By Robert Silverberg a try.

https://en.wikipedia.org/wiki/Roma_Eterna

"The novel is presented as a series of vignettes over a period of about 1500 years, from 1282 ab urbe condita (AD 529) to 2723 AUC (AD 1970). Most of the story-chapters involve Roman politics, either the competition between the Western and Eastern Empires to dominate the other or the violent creation of the Second Roman Republic in about 2603 AUC (AD 1850). Others describe the first Roman circumnavigation of the world and unsuccessful attempts to conquer Nova Roma (Central America).

Many features of our own history are repeated in this history, though under changed circumstances: the equivalent of the 16th and 17th centuries have bold navigators and adventurers, romanticised by later generations but unpleasantly brutal and ruthless when looked at closely; in the late 18th to mid-19th centuries, a decadent old order is overthrown by revolution followed by a reign of terror and the reemergence of Republicanism; though Italy remains a central part of the Roman Empire, the Latin dialect spoken there develops into a kind of Italian, and the name "Marcus" changes into "Marco"; though Vienna is a provincial capital which never had an Emperor of its own, its population dances the Waltz; by the 20th century, people travel by cars rather than carriages and by the second half of the century, space flight is achieved.

It concludes with the first story to be written, when a group of Hebrew citizens in Alexandria prepare to depart Earth in a rocket which explodes shortly after takeoff. But they will try again, still believing God chose them to inherit the Promised Land, just not on Rome-dominated Earth."

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Response to Currentsitguy (Reply #42)

Wed Feb 28, 2018, 09:26 PM

43. I haven't read anything by Silverberg in decades...I love works of alternate history...

 

Even though Man in the High Castle has been modified somewhat relative to the book, the expansion that they made has been pretty incredible. I hope that they can keep the quality high. I do struggle a bit with "Hitler"....but I like the cast generally. I even enjoyed Spike Lee's "C.S.A", especially the commercials although the actors were pretty stiff and wooden.

I do want to warn you, you will have to endure some liberal assertions and comments at the beginning of Caesars Messiah. I don't remember anything like that during the main body of the movie.

You can also sense their the low-budget in the look and feel of the doc.



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Response to buck_turgidson (Reply #43)

Wed Feb 28, 2018, 09:42 PM

44. Whatever. I read what interests me and for the literary quality, not the politics.

My wife and I so far have LOVED The Man In The High Castle.

Check out Philip K. Dick's Electric Dreams on Amazon Prime Video. It's an anthology series that we thought was fantastic.

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Response to Currentsitguy (Reply #44)

Wed Feb 28, 2018, 10:02 PM

45. I'll check it out. Let me know how you like Caesar's Messiah.

 

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Response to buck_turgidson (Reply #45)

Wed Feb 28, 2018, 10:32 PM

46. I'll be sure to

You do the same.

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Response to Killdozer (Original post)

Sat Feb 10, 2018, 10:48 PM

5. What if...


They have mastered time travel?



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Response to wonderwarthog (Reply #5)

Wed Feb 28, 2018, 10:22 AM

30. Ah, Stephen Hawking

"If time travel were possible, why aren't we inundated with tourists from the future?"

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Response to Currentsitguy (Reply #30)

Wed Feb 28, 2018, 11:14 PM

47. perhaps...


we are!

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Response to wonderwarthog (Reply #47)

Wed Feb 28, 2018, 11:45 PM

48. I don't see a lot of people in hideous clothes...

Speaking VERY LOUDLY to the help, with cameras, do you?

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Response to Killdozer (Original post)

Sat Feb 10, 2018, 11:00 PM

6. How about worn holes if they exist.

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Response to fszwfnj (Reply #6)

Sun Feb 11, 2018, 04:36 AM

10. I hate when wormholes are worn.

Real nuisance, it is: It's not as though you can just pick up new ones from the mall.

"6. How about worn holes if they exist.

https://www.space.com/20881-wormholes.html"

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Response to fszwfnj (Reply #6)

Sun Feb 11, 2018, 07:24 AM

15. Wormholes would not give them the ability to detect us.

 

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Response to Killdozer (Original post)

Sat Feb 10, 2018, 11:10 PM

7. What if we, as homo sapiens, were already descended from an alien species already here from a galaxy

Far, far away a long, long time ago ...

What if aliens communicated w/ us thru psychedelic substances and m.j. which is why they are always little green men ... Schwa be w/ you .

πŸ€–πŸ‘½πŸ‘½πŸ‘ΎπŸ‘½πŸ‘½πŸ˜ˆ

βœŒπŸ––βœŒπŸ––βœŒπŸ––

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Response to RATFINK_5.0 (Reply #7)

Sun Feb 11, 2018, 04:41 AM

11. A little bit Mormon, a little bit Scientology and a little bit rock n roll.

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Response to RATFINK_5.0 (Reply #7)

Sun Feb 11, 2018, 06:43 AM

13. maybe they resemble al dente spagetti

and travel the universe in interdimensional collanders using tomato sauces as fuel ........

?1310664498

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Response to Killdozer (Original post)

Sat Feb 10, 2018, 11:25 PM

8. I have always thought that somewhere in space is other life.

Have they been here , no idea.

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Response to DDKick (Reply #8)

Sun Feb 11, 2018, 04:42 AM

12. I take it you've never seen my father's side of the family.

I love all of them tons, but must admit I was a little relieved when I finally learned we did not share DNA.

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Response to Killdozer (Original post)

Sat Feb 10, 2018, 11:28 PM

9. No one knows, but I would bet they are here among us now.

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Response to joefriday6 (Reply #9)

Sun Feb 11, 2018, 06:44 AM

14. one is attached to the top of trump's head .....

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Response to rampartb (Reply #14)

Sun Mar 4, 2018, 12:21 AM

49. Oh no....

not....

A Tribble!!!


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Response to joefriday6 (Reply #9)

Sun Feb 11, 2018, 02:11 PM

17. You have discovered our secret!

Your days are numbered!

Resistance is futile!

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Response to Lowrider1984 (Reply #17)

Sun Feb 11, 2018, 04:51 PM

18. Our days are numbered whether aliens are with us or not. Muslims have a 1.8 population growth rate.

The rest of the world is at 1.1. Muslims will occupy 25 per cent of the world's population by 2030 with their growth rates increasing every year.

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Response to joefriday6 (Reply #18)

Mon Feb 12, 2018, 12:14 PM

21. Agreed. That is part of their plan to take over the world.

It is clearly spelled out in their "holy" book, the Koran.
If you cannot defeat the "infidel" militarily, move to their homeland and out-breed them.
Take as many wives as you can support, and have as many children as possible.
Of course, the liberal "infidel" governments say "Oh, that is just rhetoric. They don't REALLY mean it!"
We are doomed.

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Response to Lowrider1984 (Reply #21)

Mon Feb 12, 2018, 12:31 PM

22. Well, up through Eisenhower, we had a good run. Then a steady downhill. As we move closer to

the end, life will be unbearable for 85 to 90 per cent of the people.

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Response to joefriday6 (Reply #22)

Mon Feb 12, 2018, 12:35 PM

23. Well, the GOOD news is

we may be DEAD by then!

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Response to Lowrider1984 (Reply #23)

Mon Feb 12, 2018, 01:38 PM

24. Probably. That's why the nuclear clock advanced another minute a couple weeks ago. The bankers are

not happy.

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Response to Killdozer (Original post)

Sun Feb 11, 2018, 09:02 AM

16. Sub space radio

and warp drive. Just kidding, yep space is big and pretty empty.

You have to throw out physics as we know it, to think people are just zipping around in space.

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Response to Killdozer (Original post)

Sun Feb 11, 2018, 05:29 PM

19. I'm pretty sure a few of the Lefties in this forum are from another planet

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Response to Killdozer (Original post)

Mon Feb 12, 2018, 11:15 AM

20. They'd have to have the technology to find us.

Then they'd need the technology to get to us.
Depending on how far away they are they could be looking at dinosaurs if they could observe the planet.
They would have no way of knowing if there would be anything left here by the time they got here.
They certainly wouldn't send living beings on such a journey. They would send robots first, like we did with Mars.

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Response to Killdozer (Original post)

Thu Feb 15, 2018, 01:57 AM

25. Best place to look for extraterrestrials is ground zero for total lunar eclipse

Read it in a book somewhere.

Chances of a world having a satellite that is the perceived same diameter as the local primary has to be infinitesimally remote. If there are XTs running around, that would have to be an amazingly interesting tourism event. If you want to find them, best place to look is at the people looking up.

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Response to Killdozer (Original post)

Sun Feb 25, 2018, 07:03 PM

26. We can't know

1) While I think that it is unlikely that we have been visited by extraterrestrials I cannot prove the negative.

2) How do you know that none of our radio signals have reached the vast distances to be received by any existing intelligent species? I don't think that you can. Among other points I recall reading a speculative article arguing that life, including possibly intelligent life my exist on a planet orbiting Alpha Centuri.

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Response to smalllivingeddy (Reply #26)

Sun Feb 25, 2018, 07:30 PM

27. That is easy.

 

We have been sending out radio signals for only about 100 years. This isn't near enough time for them to cross the vast distances needed.

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Response to Killdozer (Reply #27)

Tue Feb 27, 2018, 02:49 PM

28. 14600 Stars within that range.

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