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Search results for tag #astronomy

JJDavis :terminal: boosted

[?]Juan Carlos Muñoz » 🌐
@astro_jcm@mastodon.online

RE: mastodon.social/@esoastronomy/

The impact of satellite constellations on astronomy can get much worse. A new ESO study has quantified not only the effects of the satellite streaks, but also the overall increase in the sky brightness due to (a) millions of faint satellites that create a veil of diffuse light, and (b) sunlight scattered by space mirrors, even when not aiming directly at the observer. 👇

    [?]Philosophics » 🌐
    @microglyphics@mastodon.social

    Riffing on the idea of identity and selfhood after reading Ishiguro's Klara and the Sun.

    open.substack.com/pub/brywilli

      muddle 🥣 boosted

      [?]Dr. Victoria Grinberg » 🌐
      @vicgrinberg@mastodon.social

      We are all stardust.

      The oxygen you breath? That comes from dying massive stars, ending their life in a supernova.

      The iron in your blood? Some from massive stars dying, but mainly fron white dwarfs, the leftovers of dwarf stars like our own Sun, exploding.

      Carbon, the basis of life? Mostly from dying low mass stars.

      The gold ring on your finger? Mostly from merging neutron stars, leftovers from supernovae.

      Table of elements colored by their cosmic origin: big bang fusion, cosmic ray fusion, merging neutron stars, exploring massive stars, dying low mass stars, exploring white dwarfs.

      Alt...Table of elements colored by their cosmic origin: big bang fusion, cosmic ray fusion, merging neutron stars, exploring massive stars, dying low mass stars, exploring white dwarfs.

        [?]Dr. Victoria Grinberg » 🌐
        @vicgrinberg@mastodon.social

        Scales of the Universe:

        Out Sun is five billion years old and will live another five billion.

        A star with ten times the mass, lives some twenty million years, larger stars have an even shirter lifetime.

        A star with half the mass of the Sun will live hundred billion years. Our universe is 13.7 billion years old -- the oldest low mass stars are not even past their teenage years yet.

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

          Naming the Universe

          How the quick thinking of internationally minded astronomers avoided stamping the solar system with petty European rivalries

          by Stephen Case

          aeon.co/essays/how-gods-beat-a

          Books by John Herschel at PG:
          gutenberg.org/ebooks/author/48

          Planetary System. Eclipse of the Sun. The Moon. The Zodiacal Light. Meteoric Shower. From Yaggy’s Geographical Study, 1887. An illustrated educational diagram depicting the solar system with orbital paths around a central sun, comets, and the zodiacal light. The corners feature vignette illustrations of related astronomical phenomena: a solar eclipse, the moon, the zodiacal light, and a meteoric shower. https://fr.wikipedia.org/wiki/Fichier:Levi_Walter_Yaggy_Planetary_System_1887.jpg

          Alt...Planetary System. Eclipse of the Sun. The Moon. The Zodiacal Light. Meteoric Shower. From Yaggy’s Geographical Study, 1887. An illustrated educational diagram depicting the solar system with orbital paths around a central sun, comets, and the zodiacal light. The corners feature vignette illustrations of related astronomical phenomena: a solar eclipse, the moon, the zodiacal light, and a meteoric shower. https://fr.wikipedia.org/wiki/Fichier:Levi_Walter_Yaggy_Planetary_System_1887.jpg

            JJDavis :terminal: boosted

            [?]Christopher Kyba 🇨🇦🇩🇪🇪🇺 » 🌐
            @skyglowberlin@fediscience.org

            Any astronomers looking for a wild new job?

            I got a message from an ecologist in Belgium today, and he's looking for a postdoc with experience in photometry to work on analysis of all-sky imagery for an experiment on the impact of on birds.

            This is not a job offer! He would work together with the candidate on an internal university grant.

            If anyone is interested (PhD in or closely related field required), send me a message.

              [?]R.L. Dane :Debian: :FreeBSD: :OpenBSD: :NetBSD:🍵 :MiraLovesYou: [he/him/my good fellow] » 🌐
              @rl_dane@polymaths.social

              Today's #APOD is especially for #VanGogh fans. =)

              Date: 2026 June 19
              URL: https://apod.nasa.gov/apod/ap260619.html
              Title: Starry Night II

              #NASA #Astronomy #PictureOfTheDay #StarryNight

                CMDR Yojimbosan 🅅⁂ boosted

                [?]Jon Sullivan » 🌐
                @joncounts@mastodon.nz

                One of the advantages of being in the week of the shortest days of the year is biking home from work after dark, in cold clear air, with the universe sparkling overhead.

                Here's this evening with the Moon, Venus, Jupiter, and Mercury all lined up above the western horizon, from Lincoln, NZ.

                flickr.com/photos/mollivan_jon

                A photo at twilight with the last orange glow of the day along the horizon behind silhouetted trees. In the sky, in a line, are the crescent Moon, Venus, Jupiter, and Mercury.

                Alt...A photo at twilight with the last orange glow of the day along the horizon behind silhouetted trees. In the sky, in a line, are the crescent Moon, Venus, Jupiter, and Mercury.

                A closer cropped view of the photo showing, in a line from top right, the crescent Moon, Venus, Jupiter, and Mercury.

                Alt...A closer cropped view of the photo showing, in a line from top right, the crescent Moon, Venus, Jupiter, and Mercury.

                  Vassil Nikolov | Васил Николов boosted

                  [?]Paolo Amoroso » 🌐
                  @amoroso@oldbytes.space

                  Venus is the bright dot close to the lunar crescent, which has a hint of earthshine. Jupiter is the dimmer dot near the center. A jet contrail to the top of Jupiter photobombs the framing, or makes it nicer depending on how you view it.

                  I took the photo with my Pixel 7 Pro phone from Milan, Italy, on June 17, 2026 at 20:08 UTC.

                  View of an urban area at dusk from an upper floor of an apartment building, with some treetops at left and the upper floors of apartment buildings in the distance at the horizon, near the bottom right of the frame. On the clear sky, close to the thin lunar waxing crescent, is a bright white dot. To the top of this pair is the horizontal, thin, short white line of a jet contrail. At the center of the frame is a dimmer white dot.

                  Alt...View of an urban area at dusk from an upper floor of an apartment building, with some treetops at left and the upper floors of apartment buildings in the distance at the horizon, near the bottom right of the frame. On the clear sky, close to the thin lunar waxing crescent, is a bright white dot. To the top of this pair is the horizontal, thin, short white line of a jet contrail. At the center of the frame is a dimmer white dot.

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

                    What Would Happen if the Sun Stopped? Part 2: Kelvin and Helmholtz at the Ready

                    By Paul Sutter

                    universetoday.com/articles/wha

                    About Kelvin-Helmholtz mechanism:
                    en.wikipedia.org/wiki/Kelvin%E

                    Books by Baron Kevin and Helmholtz at PG
                    gutenberg.org/ebooks/author/48
                    gutenberg.org/ebooks/author/59

                    William Thomson, Lord Kelvin, whose famously wrong answer for the Sun's age turns out to be exactly the calculation we need. A black-and-white studio portrait of Lord Kelvin with white hair and a full white beard, wearing a formal suit, waistcoat, tie, and watch chain. He has a serious expression and is looking slightly away from the camera. https://upload.wikimedia.org/wikipedia/commons/d/db/Kelvin-1200-scale1000.jpg

                    Alt...William Thomson, Lord Kelvin, whose famously wrong answer for the Sun's age turns out to be exactly the calculation we need. A black-and-white studio portrait of Lord Kelvin with white hair and a full white beard, wearing a formal suit, waistcoat, tie, and watch chain. He has a serious expression and is looking slightly away from the camera. https://upload.wikimedia.org/wikipedia/commons/d/db/Kelvin-1200-scale1000.jpg

                      muddle 🥣 boosted

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

                      June 1980: Vera Rubin Publishes Paper Hinting at Dark Matter

                      Work by Rubin, a champion of women in science, suggested that galaxies contain hidden mass.

                      By Tess Joosse (from the archives)

                      aps.org/apsnews/2023/05/vera-r

                      Her autobiographical article is available online:
                      annualreviews.org/content/jour

                      Vera Rubin, Dept. of Terrestrial Magnetism, Carnegie Institute of Washington. Elderly white-hairedVera Rubin smiling warmly, wearing a red jacket, photographed outdoors in natural light. https://commons.wikimedia.org/wiki/File:Vera_Rubin.jpg

                      Alt...Vera Rubin, Dept. of Terrestrial Magnetism, Carnegie Institute of Washington. Elderly white-hairedVera Rubin smiling warmly, wearing a red jacket, photographed outdoors in natural light. https://commons.wikimedia.org/wiki/File:Vera_Rubin.jpg

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

                        Anatomy of a Galileo Forgery

                        It was hailed as a historic discovery—until a trail of clues revealed one of the rare-book world’s most audacious scams.

                        By: Matthew Wills

                        daily.jstor.org/anatomy-of-a-g

                        Books by Galileo Galilei at PG:
                        gutenberg.org/ebooks/author/39

                        Title page of Sidereus nuncius, 1610, by Galileo Galilei (1564-1642). The original Latin title page of Galileo Galilei's landmark astronomical work, announcing observations of the Moon, fixed stars, the Milky Way, and four Jupiter moons named "Medicea Sidera." Published by Thomas Baglioni in Venice (MDCX), with an ornate engraved publisher's vignette of an enthroned figure below the text. https://en.wikipedia.org/wiki/Sidereus_Nuncius#/media/File:Houghton_IC6.G1333.610sa_-_Sidereus_nuncius.jpg

                        Alt...Title page of Sidereus nuncius, 1610, by Galileo Galilei (1564-1642). The original Latin title page of Galileo Galilei's landmark astronomical work, announcing observations of the Moon, fixed stars, the Milky Way, and four Jupiter moons named "Medicea Sidera." Published by Thomas Baglioni in Venice (MDCX), with an ornate engraved publisher's vignette of an enthroned figure below the text. https://en.wikipedia.org/wiki/Sidereus_Nuncius#/media/File:Houghton_IC6.G1333.610sa_-_Sidereus_nuncius.jpg

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