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Understanding Stars, Constellations, and Galaxies in the Expanding Universe

Discover the fascinating world of stars and galaxies! Explore how constellations are formed, the color of stars indicating their temperature, and the lifecycle of a star from birth to its end stages. Learn about galaxies, including the types (spiral, elliptical, and irregular) and the presence of black holes at their centers. Understand the concept of light-years and the universe's expansion, along with the potential futures it holds. Join us on a journey through the cosmos and unveil the mysteries of the universe!

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Understanding Stars, Constellations, and Galaxies in the Expanding Universe

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Presentation Transcript

  1. The Rest of the Universe Stars and Galaxies

  2. Stars • constellations- an imaginary picture made by groups of stars; example: The Big Dipper • The color of the star indicates the temperature. Blue is the hottest, red is the coolest. • apparent magnitude- how bright a star looks from Earth. Things far away appear to look dim.

  3. A Star’s Life 1. Birth- created from cloud of gas and dust 2. Adulthood- uses hydrogen and helium for nuclear fusion fuel 3. Old age- enlarges into a red giant or supergiant 4. or 4. Explodes in a supernova! 4. Uses up its fuel and becomes a dwarf star (white, then brown then black when doesn’t give off any more light) 5. Neutron star (2-3 times mass of our sun) 5. Black hole (>7 times mass of our sun) or

  4. Galaxies • galaxy- a group of stars, gas and dust held by gravity • Three types: spiral (our Milky Way), elliptical and irregular • Stars revolve around the center of their galaxy. • Most galaxies have a black hole in the center! • Light-year= the distance light travels in one year

  5. What’s Next • The universe is expanding, constantly getting bigger, so things are getting further apart. • It could a) keep expanding forever b) slow down and stay the same size c) slow and start shrinking • No one knows what will happen!

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