Forwarded from Upsc Science and technology
🔆What is a Spiral Galaxy?
✅NASA Hubble Space Telescope recently shared a stunning video of a spiral galaxy known as Caldwell 45, or NGC 5248.
📍Spiral Galaxy:
✅Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot, young stars.
✅In a spiral galaxy, the stars, gas, and dust are gathered in spiral arms that spread outward from the galaxy's center.
✅Most of the galaxies that scientists have discovered so far are spiral galaxies, as opposed to the other two main categories of galaxy shapes—elliptical and irregular.
✅Approximately 60% of all galaxies are thought to be spiral galaxies.
✅The Milky Way, the galaxy that includes Earth and our solar system, is an example of a spiral galaxy.
📍Structure:
✅Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars.
✅The bulge in the center is made up of older, dimmer stars and is thought to contain a supermassive black hole.
✅Approximately two-thirds of spiral galaxies also contain a bar structure through their center, as does the Milky Way.
✅The disk of stars orbiting the bulge separates into arms that circle the galaxy.
✅These spiral arms contain a wealth of gas and dust and younger stars that shine brightly before their quick demise.
✅The majority of spiral galaxies rotate in the sense that the arms trail the direction of the spin.
✅The visible portion of spiral galaxies contains only a small fraction of the total mass of the galaxy, and that spiral galaxies are surrounded by an extensive halo consisting mostly of dark matter.
✅Spiral galaxies are thought to evolve into elliptical galaxies as the spirals get older.
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@upsc_science_and_technology
✅NASA Hubble Space Telescope recently shared a stunning video of a spiral galaxy known as Caldwell 45, or NGC 5248.
📍Spiral Galaxy:
✅Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot, young stars.
✅In a spiral galaxy, the stars, gas, and dust are gathered in spiral arms that spread outward from the galaxy's center.
✅Most of the galaxies that scientists have discovered so far are spiral galaxies, as opposed to the other two main categories of galaxy shapes—elliptical and irregular.
✅Approximately 60% of all galaxies are thought to be spiral galaxies.
✅The Milky Way, the galaxy that includes Earth and our solar system, is an example of a spiral galaxy.
📍Structure:
✅Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars.
✅The bulge in the center is made up of older, dimmer stars and is thought to contain a supermassive black hole.
✅Approximately two-thirds of spiral galaxies also contain a bar structure through their center, as does the Milky Way.
✅The disk of stars orbiting the bulge separates into arms that circle the galaxy.
✅These spiral arms contain a wealth of gas and dust and younger stars that shine brightly before their quick demise.
✅The majority of spiral galaxies rotate in the sense that the arms trail the direction of the spin.
✅The visible portion of spiral galaxies contains only a small fraction of the total mass of the galaxy, and that spiral galaxies are surrounded by an extensive halo consisting mostly of dark matter.
✅Spiral galaxies are thought to evolve into elliptical galaxies as the spirals get older.
#gs3
#prelims
#science_technology
@upsc_science_and_technology
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