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Search results for tag #astronomy

[?]Project Gutenberg » 🌐
@gutenberg_org@mastodon.social

Could Pluto Once Again Be Considered a Planet? New Remarks From NASA’s Administrator Highlight an Enduring Debate Among Scientists

Two decades ago, the International Astronomical Union—which defines and names celestial bodies—redefined the criteria for being a planet, putting Pluto into the new category of dwarf planet

by Margherita Bassi

smithsonianmag.com/smart-news/

Pluto at PG:
gutenberg.org/ebooks/subject/2

The astronomer Clyde Tombaugh, discoverer of Pluto here shown with his homemade 9-inch telescope. A black-and-white photograph shows a young man standing outdoors beside a large telescope mounted on a tripod-like base. He is wearing glasses, a white dress shirt with rolled sleeves, a striped tie, and high-waisted trousers. One hand rests on the telescope tube while he looks toward it with a focused expression. The telescope has large lettering reading “NEWTONIAN TELESCOPE” and appears to be a long cylindrical reflector telescope pointed upward at an angle. The setting looks rural or open countryside, with grass and vegetation in the background. https://en.wikipedia.org/wiki/Pluto#/media/File:Clyde_W._Tombaugh.jpeg

Alt...The astronomer Clyde Tombaugh, discoverer of Pluto here shown with his homemade 9-inch telescope. A black-and-white photograph shows a young man standing outdoors beside a large telescope mounted on a tripod-like base. He is wearing glasses, a white dress shirt with rolled sleeves, a striped tie, and high-waisted trousers. One hand rests on the telescope tube while he looks toward it with a focused expression. The telescope has large lettering reading “NEWTONIAN TELESCOPE” and appears to be a long cylindrical reflector telescope pointed upward at an angle. The setting looks rural or open countryside, with grass and vegetation in the background. https://en.wikipedia.org/wiki/Pluto#/media/File:Clyde_W._Tombaugh.jpeg

    [?]Project Gutenberg » 🌐
    @gutenberg_org@mastodon.social

    Astronomers pin down the origins of a planetary odd couple

    New measurements of a hot Jupiter and its mini-Neptune companion suggest both planets formed surprisingly far away from their host star.

    by Jennifer Chu

    news.mit.edu/2026/astronomers-

    astronomy at PG:
    gutenberg.org/ebooks/bookshelf

    An annotated picture of Neptune's many moons as captured by the James Webb Space Telescope. The bright blue diffraction star is Triton, Neptune's largest moon. Webb's 2022 infrared image offers the clearest view of Neptune's rings in 30+ years, revealing dust bands, 7 moons including the brilliantly reflective Triton, and rings unseen since Voyager 2's 1989 flyby. https://www.flickr.com/photos/nasawebbtelescope/52374271658/

    Alt...An annotated picture of Neptune's many moons as captured by the James Webb Space Telescope. The bright blue diffraction star is Triton, Neptune's largest moon. Webb's 2022 infrared image offers the clearest view of Neptune's rings in 30+ years, revealing dust bands, 7 moons including the brilliantly reflective Triton, and rings unseen since Voyager 2's 1989 flyby. https://www.flickr.com/photos/nasawebbtelescope/52374271658/

      muddle boosted

      [?]Corey S Powell » 🌐
      @coreyspowell@mastodon.social

      Astronomers have measured the power of a jet streaming from a black hole.

      The jet from Cygnus X-1 -- a black hole orbiting a massive blue star -- is 10,000 times as powerful as the whole Sun! (That's 10^37 ergs/sec.) And it's moving at 50% the speed of light.

      news.wisc.edu/scientists-measu

      Jets of energetic particles streaming away from the black hole Cygnus X-1 (at left in this artist’s rendering) bend in the stellar wind from the supergiant star paired in orbit with the black hole. Researchers used the extent of the bending to produce the first measurement of the power of a black hole’s jets. Image: ICRAR/Curtin University

      Alt...Jets of energetic particles streaming away from the black hole Cygnus X-1 (at left in this artist’s rendering) bend in the stellar wind from the supergiant star paired in orbit with the black hole. Researchers used the extent of the bending to produce the first measurement of the power of a black hole’s jets. Image: ICRAR/Curtin University

        [?]Project Gutenberg » 🌐
        @gutenberg_org@mastodon.social

        Why ‘little red dots’ pose a big mystery about the Universe

        by Jenny Greene

        aeon.co/essays/why-little-red-

        Original paper here:
        arxiv.org/abs/2306.07320

        Astronomy at PG:
        gutenberg.org/ebooks/bookshelf

        Hubble Ultra-Deep Field image of a region of the observable universe (equivalent sky area size shown in bottom left corner), near the constellation Fornax. Each spot is a galaxy, consisting of billions of stars. The light from the smallest, most redshifted galaxies originated around 12.6 billion years ago, close to the age of the universe. https://commons.wikimedia.org/wiki/File:HubbleUltraDeepFieldwithScaleComparison.jpg

        Alt...Hubble Ultra-Deep Field image of a region of the observable universe (equivalent sky area size shown in bottom left corner), near the constellation Fornax. Each spot is a galaxy, consisting of billions of stars. The light from the smallest, most redshifted galaxies originated around 12.6 billion years ago, close to the age of the universe. https://commons.wikimedia.org/wiki/File:HubbleUltraDeepFieldwithScaleComparison.jpg

          [?]⠵⠻⠷⠕⠭ 🍥🍉⚪🌹 » 🌐
          @z3r0fox@mastodon.social

          Pretty crescent moon between Jupiter above and Venus below tonight. Planets just visible in phone snap but look irl

            [?]Luke Miller » 🌐
            @upmultimedia@mastodon.gamedev.place

            A 5-year time lapse of the Dark Energy Spectroscopic Instrument (DESI) taking snapshots of the sky to create a 3D map of the universe.

            Earth is at the centre and the map goes out to about out to 11 billion lightyears. Each dot is a galaxy.

            youtube.com/watch?v=ZK20UJW8K64

              [?]Yora » 🌐
              @yora@mastodon.gamedev.place

              What do we call a planet that is not a dwarf planet or a gas planet? We can't just call them "planet", because that would be confusing, stupid, and make no sense.

                [?]Project Gutenberg » 🌐
                @gutenberg_org@mastodon.social

                A revolution in time

                Once local and irregular, time-keeping became universal and linear in 311 BCE. History would never be the same again

                by Paul J Kosmin

                aeon.co/essays/when-time-becam

                Cosmology at PG:
                gutenberg.org/ebooks/subject/7

                La Materia della Divina Commedia di Dante Alighieri Dichiarata in VI Tavole, 1872. By Michelangelo Caetani, Monte Cassino Abbey. The diagram depicts across six tables: The conical structure of Hell (Inferno), descending in nine concentric circles toward Satan at the centre of the Earth The terraces of Purgatory, rising as a mountain on the opposite side of the globe The concentric celestial spheres of Paradise (Paradiso), ascending through the planetary heavens to the Empyrean The moral and theological categories of souls assigned to each level Precise spatial and numerical relationships reflecting Dante's Scholastic cosmology https://pdimagearchive.org/images/710def6c-ff0f-49d6-9c77-dbded91bbc13/

                Alt...La Materia della Divina Commedia di Dante Alighieri Dichiarata in VI Tavole, 1872. By Michelangelo Caetani, Monte Cassino Abbey. The diagram depicts across six tables: The conical structure of Hell (Inferno), descending in nine concentric circles toward Satan at the centre of the Earth The terraces of Purgatory, rising as a mountain on the opposite side of the globe The concentric celestial spheres of Paradise (Paradiso), ascending through the planetary heavens to the Empyrean The moral and theological categories of souls assigned to each level Precise spatial and numerical relationships reflecting Dante's Scholastic cosmology https://pdimagearchive.org/images/710def6c-ff0f-49d6-9c77-dbded91bbc13/

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