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Earth is not the Metric ...

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  • #46
    Maybe the Earth is an outlier?

    Not many planetary systems that look like the Solar System indicating that planets with all the features of Earth may not be common at all.

    https://phys.org/news/2016-12-microl...tune-mass.html

    Any metaphor will tear if stretched over too much reality.

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    • #47
      At this point, I don't think we have enough information to know whether other systems really look like ours or not. It's entirely possible there's lots of smaller worlds we simply can't detect yet.

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      • #48
        Indeed the initial detection systems were only good enough to pick up gas giants. As techniques have become refined the number of rocky earth sized planets detected is beginning to increase
        Human history becomes more and more a race between education and catastrophe (H G Wells)
        Mit der Dummheit kaempfen Goetter selbst vergebens (Friedrich von Schiller)

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        • #49
          No Way Out? Aliens on 'Super-Earth' Planets May Be Trapped by Gravity

          https://www.space.com/40375-super-ea...ns-launch.html
          TANSTAAFL = There Ain't No Such Thing As A Free Lunch
          “War is merely the continuation of politics by other means” - von Clausewitz
          Present Current Events are the Future's History

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          • #50
            A Trillion Worlds

            Big-data statistics have revealed, among other things, that our own solar system is kind of an oddball.

            https://getpocket.com/explore/item/a...=pocket-newtab
            TANSTAAFL = There Ain't No Such Thing As A Free Lunch
            “War is merely the continuation of politics by other means” - von Clausewitz
            Present Current Events are the Future's History

            Comment


            • #51
              Our Solar System Is Even Stranger Than We Thought

              New research shows a pattern of exoplanet sizes and spacing around other stars unlike what we see in our own system.

              https://getpocket.com/explore/item/o...=pocket-newtab
              TANSTAAFL = There Ain't No Such Thing As A Free Lunch
              “War is merely the continuation of politics by other means” - von Clausewitz
              Present Current Events are the Future's History

              Comment


              • #52
                'Giant impact' theory of moon's formation gets another boost

                By Elizabeth Howell 19 hours ago

                Scientists have found yet more differences between Earth and moon rocks.
                ....
                Scientists have found fresh evidence in lunar rocks showing that the moon was likely formed after a Mars-sized planet crashed into the proto-Earth more than 4 billion years ago.

                A NASA-led team examined moon rocks brought back to Earth by Apollo astronauts more than 50 years ago. Investigating the samples with advanced tools not available to researchers in the 1960s and 1970s, the team found further evidence of the "giant impact theory" by focusing on the amount and type of chlorine in the rocks, a new study reports.

                The researchers discovered the moon has a higher concentration of "heavy" chlorine compared to Earth, which sports more "light" chlorine. The terms "heavy" and "light" refer to versions of the chlorine atom, known as isotopes, that contain different numbers of neutrons in their nuclei.
                ...
                Shortly after the mammoth collision occurred, Earth was just able to stay together while pieces of both planets that were blasted into space coalesced to form the moon. Both of these blobby bodies had a mix of light and heavy chlorine isotopes at first, but that mix began to change as Earth's gravity pulled on the newly forming moon.
                ....
                https://www.space.com/moon-giant-imp...orine-isotopes
                TANSTAAFL = There Ain't No Such Thing As A Free Lunch
                “War is merely the continuation of politics by other means” - von Clausewitz
                Present Current Events are the Future's History

                Comment


                • #53
                  This piece goes into the issue of if life has to be carbon based ... therefore the question of finding such if we don't recognize it ...
                  Are Aliens Hiding in Plain Sight?

                  Several missions this year are seeking out life on the red planet. But would we recognize extraterrestrials if we found them?

                  ....
                  https://getpocket.com/explore/item/a...=pocket-newtab

                  There's "life".
                  Then there's intelligent life (as seen with livestock and pets).
                  Then there's intelligent life able to make fire and melt metal.
                  TANSTAAFL = There Ain't No Such Thing As A Free Lunch
                  “War is merely the continuation of politics by other means” - von Clausewitz
                  Present Current Events are the Future's History

                  Comment

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