Bruce Tuncks Posted January 23, 2021 Share Posted January 23, 2021 But where are they? You would think a time-travel visit would be popular... alas, I don't think there are any out there. Link to comment Share on other sites More sharing options...
Old Koreelah Posted January 23, 2021 Share Posted January 23, 2021 4 hours ago, Marty_d said: I think it's a bit wrong to assume that just because we can't see other "goldilocks" planets, means they don't exist. They estimate around 100 billion planets in our galaxy alone, and there are millions of galaxies. There could be literally thousands of Earth-like planets out there, which we may never know about. Maybe we missed them. It took billions of years for life to evolve on this planet and it’s current ideal state may not last more than a few million more years- a blip in the geological time frame. Any number of cataclysms could render it a lifeless mess. That might have already happened on other planets and it takes so long for their light to reach us, their “civilizations” may already have been and gone. Link to comment Share on other sites More sharing options...
octave Posted January 23, 2021 Share Posted January 23, 2021 In terms of looking for "habitable" planets, yes we haven't really found any yet but we have hardly looked. The estimates for the number of stars in our galaxy range from 100 to 400 billion. I would suggest that the percentage of these stars that we have studied would be amazingly small. The first radio transmissions on earth occurred in 1895. We could think about it the other way around, has any other life form discovered us? The earliest forms of life on earth are thought to be 3.7 Billion years old. Out of that 3.7 Billion year history we have only been detectable (radio waves) for the last 126 years and only within a distance of 126 light years. These first radio signals were rather week. It wasn't until 1974 that a signal was intentionally beamed beyond our solar system. I suspect we would be hard to find. There are many reasons we may have not yet detected other life. Some planets we have looked at (in a radio sense) may be at an equivalent level of technological development that humans were in 1800. Given the vast distances we may even one day detect a civilization that has developed and petered out. As we look at distant stars we are also looking back in time. A planet orbiting a distant star may have no detectable signal now but those signals may not have reached us yet. Perhaps radio waves are not the way an advanced civilization would communicate. 3 Link to comment Share on other sites More sharing options...
octave Posted January 23, 2021 Share Posted January 23, 2021 The galaxy in the image is a reconstruction of the Milky Way, if it were about 110,000 light-years in diameter (more recent research suggests it's even bigger than that). The itsy bitsy blue dot is how far our radio signals have travelled from Earth - a diameter of about 200 light-years. https://www.sciencealert.com/humanity-hasn-t-reached-as-far-into-space-as-you-think 1 Link to comment Share on other sites More sharing options...
willedoo Posted January 23, 2021 Share Posted January 23, 2021 21 minutes ago, octave said: The galaxy in the image is a reconstruction of the Milky Way, if it were about 110,000 light-years in diameter (more recent research suggests it's even bigger than that). The itsy bitsy blue dot is how far our radio signals have travelled from Earth - a diameter of about 200 light-years. https://www.sciencealert.com/humanity-hasn-t-reached-as-far-into-space-as-you-think Certainly makes you feel a bit small. 1 Link to comment Share on other sites More sharing options...
spacesailor Posted January 23, 2021 Share Posted January 23, 2021 AND ! A Big hole smack bang in the middle. Dosn,t look very Black to me !. spacesailor Link to comment Share on other sites More sharing options...
nomadpete Posted January 23, 2021 Share Posted January 23, 2021 Are you trying to belittle me ? Because of the totally big size of the universe (we can't even comprehend the size of 'our' galaxy and the number of possible Goldilocks planets therein, let alone the fantastic universe), I can't quite see the little Blue marble of which you speak. Link to comment Share on other sites More sharing options...
nomadpete Posted January 23, 2021 Share Posted January 23, 2021 (edited) Sorry but my post above was in response to a comment about 'nomads' but now I can't see that post. Aaah, now I see it all. It belongs to the 'Trivia' thread. Sorry about that. Edited January 23, 2021 by nomadpete Link to comment Share on other sites More sharing options...
Old Koreelah Posted May 31, 2021 Share Posted May 31, 2021 On 23/01/2021 at 2:42 PM, Bruce Tuncks said: Those aliens couldn't be born like we were nomad. Already the head is too big for the birth passage, and if women's hips were any bigger then they couldn't walk. So we are in an evolutionary dead end. An ever-increasing number of women are opting for Caesarian births, which have been associated with retarded development of the infant’s gut flora and immune system. On 23/01/2021 at 2:42 PM, Bruce Tuncks said: And this planet is very old. It has less time between now and the seas going dry than there is between us and the dinosaurs. Gosh that robert burns was right... " till ah the seas gang dry m'dear, and the rocks melt wi the sun... " Maybe there’s mobs more water inside our planet than we could have imagined; this short video outlines some amazing recent geological findings: 1 Link to comment Share on other sites More sharing options...
spacesailor Posted June 1, 2021 Share Posted June 1, 2021 WHY All this fuss about getting to Mars or any other planet !. In the future the nearest Galaxy ANDROMIDA will MERGE WITH Our Milky way Galaxy. Hopefully Peacefully. spacesailor Link to comment Share on other sites More sharing options...
nomadpete Posted June 1, 2021 Share Posted June 1, 2021 Not if the UN (or the US) has anything to do with it.... 2 Link to comment Share on other sites More sharing options...
willedoo Posted August 23, 2021 Share Posted August 23, 2021 Some interesting research at Curtin University on the formation of diamonds. https://www.sciencealert.com/rare-diamonds-are-actually-made-of-once-living-organisms-and-formed-hundreds-of-kilometers-underground Link to comment Share on other sites More sharing options...
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