Other life? (Introduction)

by David Turell @, Monday, June 22, 2020, 16:04 (98 days ago)

A new estimate for the Milky Way:

https://mail.yahoo.com/d/folders/1/messages/AL_Bt1lbszqfXvC61wL10J-jvOE?.intl=us&.p...

"Maybe you think one Earth is enough. But what if there were billions? Researchers make a new estimate that the number of Earth-like planets in our Milky Way galaxy can reach us high as 6 billion. Astronomers at the University of British Columbia (UBC) analyzed data from NASA's Kepler mission to reach the stunning conclusion. The information on 200,000 stars was gathered by the Kepler planet-hunting spacecraft from 2009 to 2018. The criteria used by the scientists for selecting such a planet maintained it had to be rocky, about the same size as Earth, and orbiting a star like our Sun. This planet also had to be in the habitable zone of its star, where the conditions would be just right to potentially allow for water and life.

"UBC researcher Michelle Kunimoto says that the calculations "place an upper limit of 0.18 Earth-like planets per G-type star." In other words, that's about 5 planets per Sun. Astronomer Jaymie Matthews put this from another perspective, explaining that "Our Milky Way has as many as 400 billion stars, with seven per cent of them being G-type. That means less than six billion stars may have Earth-like planets in our Galaxy." While the scientists came up with an impressive number of possible Earths, this likely doesn't mean that's how many such planets there are and if they would have life like ours. But this new estimate definitely expands the possibility that similar planets are out there.

"Taking into account what we do know, and mixing in some assumptions about life on Earth, a team of scientists have predicted that there are 36 Communicating Extra-Terrestrial Intelligent (CETI: pronounced "chetee") civilizations in our galaxy. The scientists' calculations are a response to the Drake equation. In 1961 astronomer Frank Drake proposed that having knowledge of seven factors would allow scientists to reasonably estimate the number of intelligent alien civilizations out there. They operated on the assumption that a planet's life would have to take form between 4.5 billion and 5.5 billion years after the creation of its system's star, as it did here.

"We've only been producing radio waves to send out there for 100 years, so that's assumed to be about the minimum time a civilization would have to be in existence and broadcasting for us to detect them. More realistically, the authors expect that a CETI population would have to exist for an average of 3,060 years to be detectable, which means that if life formed in both places at the same time, we'd both need to be in existence for 6,120 years to make contact. (my bold)

"'I think it is extremely important and exciting because for the first time we really have an estimate for this number of active intelligent, communicating civilizations that we potentially could contact and find out there is other life in the universe — something that has been a question for thousands of years and is still not answered," said co-author and astrophysicist Christopher Conselice of University of Nottingham."

Comment: Alpha centuri, the closest star is 4.3 light years away. Contact must be by radio waves at the speed of light. Very few stars are close enough, unless they produced radio waves thousands of years ago as discussed..

Other life?

by Balance_Maintained @, U.S.A., Tuesday, June 23, 2020, 12:27 (97 days ago) @ David Turell

"We've only been producing radio waves to send out there for 100 years, so that's assumed to be about the minimum time a civilization would have to be in existence and broadcasting for us to detect them.(bold mine) More realistically, the authors expect that a CETI population would have to exist for an average of 3,060 years to be detectable, which means that if life formed in both places at the same time, we'd both need to be in existence for 6,120 years to make contact. (my bold)

"'I think it is extremely important and exciting because for the first time we really have an estimate for this number of active intelligent, communicating civilizations that we potentially could contact and find out there is other life in the universe — something that has been a question for thousands of years and is still not answered," said co-author and astrophysicist Christopher Conselice of University of Nottingham."

David's Comment: Alpha centuri, the closest star is 4.3 light years away. Contact must be by radio waves at the speed of light. Very few stars are close enough, unless they produced radio waves thousands of years ago as discussed..

I always find these comments to be the most enlightening. We are assuming that if there is life it would have taken a similar technological progression to ourselves and would use the same technology or use physics in the same way. There is no real reason to think that, however.

--
What is the purpose of living? How about, 'to reduce needless suffering. It seems to me to be a worthy purpose.

Other life?

by dhw, Tuesday, June 23, 2020, 13:25 (97 days ago) @ Balance_Maintained

"We've only been producing radio waves to send out there for 100 years, so that's assumed to be about the minimum time a civilization would have to be in existence and broadcasting for us to detect them.(bold mine) More realistically, the authors expect that a CETI population would have to exist for an average of 3,060 years to be detectable, which means that if life formed in both places at the same time, we'd both need to be in existence for 6,120 years to make contact. (my bold)

"'I think it is extremely important and exciting because for the first time we really have an estimate for this number of active intelligent, communicating civilizations that we potentially could contact and find out there is other life in the universe — something that has been a question for thousands of years and is still not answered," said co-author and astrophysicist Christopher Conselice of University of Nottingham."

David's Comment: Alpha centuri, the closest star is 4.3 light years away. Contact must be by radio waves at the speed of light. Very few stars are close enough, unless they produced radio waves thousands of years ago as discussed..

B-M: I always find these comments to be the most enlightening. We are assuming that if there is life it would have taken a similar technological progression to ourselves and would use the same technology or use physics in the same way. There is no real reason to think that, however.

Welcome back! I hope all is well with you and your family. As for enlightenment, just wait and see the results of my research, if I can only get the $1million I need to finish it.

Other life?

by David Turell @, Tuesday, June 23, 2020, 16:10 (97 days ago) @ Balance_Maintained

"We've only been producing radio waves to send out there for 100 years, so that's assumed to be about the minimum time a civilization would have to be in existence and broadcasting for us to detect them.(bold mine) More realistically, the authors expect that a CETI population would have to exist for an average of 3,060 years to be detectable, which means that if life formed in both places at the same time, we'd both need to be in existence for 6,120 years to make contact. (my bold)

"'I think it is extremely important and exciting because for the first time we really have an estimate for this number of active intelligent, communicating civilizations that we potentially could contact and find out there is other life in the universe — something that has been a question for thousands of years and is still not answered," said co-author and astrophysicist Christopher Conselice of University of Nottingham."

David's Comment: Alpha centuri, the closest star is 4.3 light years away. Contact must be by radio waves at the speed of light. Very few stars are close enough, unless they produced radio waves thousands of years ago as discussed..


Tony: I always find these comments to be the most enlightening. We are assuming that if there is life it would have taken a similar technological progression to ourselves and would use the same technology or use physics in the same way. There is no real reason to think that, however.

The question always must come back to the biochemistry that is different and possible to create living matter. The usual conclusion is it must be carbon based life, silicon based won't hack it. Then would evolution follow different paths?

Other life?

by dhw, Tuesday, June 23, 2020, 13:20 (97 days ago) @ David Turell

QUOTES: Researchers make a new estimate that the number of Earth-like planets in our Milky Way galaxy can reach us high as 6 billion.

While the scientists came up with an impressive number of possible Earths, this likely doesn't mean that's how many such planets there are and if they would have life like ours. But this new estimate definitely expands the possibility that similar planets are out there.

Taking into account what we do know, and mixing in some assumptions about life on Earth, a team of scientists have predicted that there are 36 Communicating Extra-Terrestrial Intelligent (CETI: pronounced "chetee") civilizations in our galaxy.

'I think it is extremely important and exciting because for the first time we really have an estimate for this number of active intelligent, communicating civilizations that we potentially could contact and find out there is other life in the universe — something that has been a question for thousands of years and is still not answered," said co-author and astrophysicist Christopher Conselice of University of Nottingham."

Oh golly gosh, this really is important and exciting. Nobody has a clue how many billion planets there are in the universe, and nobody has a clue whether any of them harbour life, but wowee we now have an estimate for the Milky Way. By sheer coincidence, I myself am developing a method for estimating the number of Earthlike planets in the entire universe (not just the Milky Way) and for predicting the number of INTELLIGENT CIVILIZATIONS (ICs: pronounced “Icies”) in our universe. This important and exciting research does, however, require funding, and so may I invite everyone who reads this important and exciting post to send at least $1000 to dhw’s FARCIC (Funding Astronomical Research Concerning Intelligent Civilizations) asap. Thank you.

Other life?

by David Turell @, Tuesday, June 23, 2020, 16:15 (97 days ago) @ dhw

QUOTES: Researchers make a new estimate that the number of Earth-like planets in our Milky Way galaxy can reach us high as 6 billion.

While the scientists came up with an impressive number of possible Earths, this likely doesn't mean that's how many such planets there are and if they would have life like ours. But this new estimate definitely expands the possibility that similar planets are out there.

Taking into account what we do know, and mixing in some assumptions about life on Earth, a team of scientists have predicted that there are 36 Communicating Extra-Terrestrial Intelligent (CETI: pronounced "chetee") civilizations in our galaxy.

'I think it is extremely important and exciting because for the first time we really have an estimate for this number of active intelligent, communicating civilizations that we potentially could contact and find out there is other life in the universe — something that has been a question for thousands of years and is still not answered," said co-author and astrophysicist Christopher Conselice of University of Nottingham."

dhw: Oh golly gosh, this really is important and exciting. Nobody has a clue how many billion planets there are in the universe, and nobody has a clue whether any of them harbour life, but wowee we now have an estimate for the Milky Way. By sheer coincidence, I myself am developing a method for estimating the number of Earthlike planets in the entire universe (not just the Milky Way) and for predicting the number of INTELLIGENT CIVILIZATIONS (ICs: pronounced “Icies”) in our universe. This important and exciting research does, however, require funding, and so may I invite everyone who reads this important and exciting post to send at least $1000 to dhw’s FARCIC (Funding Astronomical Research Concerning Intelligent Civilizations) asap. Thank you.

Shouldn't we send pounds or euros?

Other life?

by dhw, Wednesday, June 24, 2020, 08:32 (96 days ago) @ David Turell

dhw: Oh golly gosh, this really is important and exciting. Nobody has a clue how many billion planets there are in the universe, and nobody has a clue whether any of them harbour life, but wowee we now have an estimate for the Milky Way. By sheer coincidence, I myself am developing a method for estimating the number of Earthlike planets in the entire universe (not just the Milky Way) and for predicting the number of INTELLIGENT CIVILIZATIONS (ICs: pronounced “Icies”) in our universe. This important and exciting research does, however, require funding, and so may I invite everyone who reads this important and exciting post to send at least $1000 to dhw’s FARCIC (Funding Astronomical Research Concerning Intelligent Civilizations) asap. Thank you.

DAVID: Shouldn't we send pounds or euros?

I’ll take any currency, but I just wanted to make it easier for you, David.

Other life?

by David Turell @, Wednesday, June 24, 2020, 15:32 (96 days ago) @ dhw

dhw: Oh golly gosh, this really is important and exciting. Nobody has a clue how many billion planets there are in the universe, and nobody has a clue whether any of them harbour life, but wowee we now have an estimate for the Milky Way. By sheer coincidence, I myself am developing a method for estimating the number of Earthlike planets in the entire universe (not just the Milky Way) and for predicting the number of INTELLIGENT CIVILIZATIONS (ICs: pronounced “Icies”) in our universe. This important and exciting research does, however, require funding, and so may I invite everyone who reads this important and exciting post to send at least $1000 to dhw’s FARCIC (Funding Astronomical Research Concerning Intelligent Civilizations) asap. Thank you.

DAVID: Shouldn't we send pounds or euros?

dhw: I’ll take any currency, but I just wanted to make it easier for you, David.

Considering rampant printing press money, Gold?

Other life?

by Balance_Maintained @, U.S.A., Friday, July 03, 2020, 07:49 (87 days ago) @ David Turell

dhw: Oh golly gosh, this really is important and exciting. Nobody has a clue how many billion planets there are in the universe, and nobody has a clue whether any of them harbour life, but wowee we now have an estimate for the Milky Way. By sheer coincidence, I myself am developing a method for estimating the number of Earthlike planets in the entire universe (not just the Milky Way) and for predicting the number of INTELLIGENT CIVILIZATIONS (ICs: pronounced “Icies”) in our universe. This important and exciting research does, however, require funding, and so may I invite everyone who reads this important and exciting post to send at least $1000 to dhw’s FARCIC (Funding Astronomical Research Concerning Intelligent Civilizations) asap. Thank you.

DAVID: Shouldn't we send pounds or euros?

dhw: I’ll take any currency, but I just wanted to make it easier for you, David.


Considering rampant printing press money, Gold?

Bitcoin!

--
What is the purpose of living? How about, 'to reduce needless suffering. It seems to me to be a worthy purpose.

Other life? Chemical evidence on Venus?

by David Turell @, Monday, September 14, 2020, 19:31 (13 days ago) @ David Turell

Phosphine is in Venus' atmosphere and the usual source is life:

https://www.sciencenews.org/article/phosphine-gas-found-venus-atmosphere-possible-sign-...

"Chemical signs of the gas phosphine have been spotted in observations of the Venusian atmosphere, researchers report September 14 in Nature Astronomy. Examining the atmosphere in millimeter wavelengths of light showed that the planet’s clouds appear to contain up to 20 parts per billion of phosphine — enough that something must be actively producing it, the researchers say.

"If the discovery holds up, and if no other explanations for the gas are found, then the hellish planet next door could be the first to yield signs of extraterrestrial life — though those are very big ifs.

“'We’re not saying it’s life,” says astronomer Jane Greaves of Cardiff University in Wales. “'We’re saying it’s a possible sign of life.”

"Venus has roughly the same mass and size as Earth, so, from far away, the neighboring planet might look like a habitable world (SN: 10/4/19). But up close, Venus is a scorching hellscape with sulfuric acid rain and crushing atmospheric pressures.

"Still, Venus might have been more hospitable in the recent past (SN: 8/26/16). And the current harsh conditions haven’t stopped astrobiologists from speculating about niches on Venus where present-day life could hang on, such as the temperate cloud decks.

“'Fifty kilometers above the surface of Venus, the conditions are what you would find if you walk out of your door right now,” at least in terms of atmospheric pressure and temperature, says planetary scientist Sanjay Limaye of the University of Wisconsin–Madison, who was not involved in the new study. The chemistry is alien, but “that’s a hospitable environment for life.”

"Previous work led by astrochemist Clara Sousa-Silva at MIT suggested that phosphine could be a promising biosignature, a chemical signature of life that can be detected in the atmospheres of other planets using Earth-based or space telescopes.

"On Earth, phosphine is associated with microbes or industrial activity — although that doesn’t mean it’s pleasant. “It’s a horrific molecule. It’s terrifying,” Sousa-Silva says. For most Earthly life, phosphine is poisonous because “it interferes with oxygen metabolism in a variety of macabre ways.” For anaerobic life, which does not use oxygen, “phosphine is not so evil,” Sousa-Silva says. Anaerobic microbes living in such places as sewage, swamps and the intestinal tracts of animals from penguins to people are the only known life-forms on Earth that produce the molecule."

Comment: This is the only galaxy with known life. Venus might have anaerobic forms.

RSS Feed of thread
powered by my little forum