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Transcript of Galaxies
Galaxies have a big role in astronomy and scientists have found many ways to describe a galaxy by its looks and formation using only technology and a theory. PARTS OF A GALAXY Clusters of old stars Most of the stars are found there
Nucleus (Center of disk)
Bulge (around the nucleus)
Spiral Arms (Extended parts of a galaxy) A dark region that
Contains hot gas and
dark matter. The Big Bang Theory Georges Lemaitre
(1894-1966) Hypothesis 15 Billion Years Old What Formed? A galaxy is a large system of stars, gas, dark matter, and dust. We live in the Milky Way. Contains meteors, comets, stars, dark matter etc. Scientists believe that galaxies formed after the Big Bang, when hydrogen and helium collapsed together. Size of Galaxies 1ly = 9.5 trillion km
(5 trillion mi) An average galaxy is 100,000 ly in diameter And 3,000 ly thick Spiral Elliptical Irregular Types of Galaxies Spiral arms
Contain hot gas, dust, and bright stars
20% Don't have a regular shape
Contain gas and dust
Contain old and new stars but the galaxy isn't bright Renaissance NASA American Civilizations Models
Human Life Looked at stars
Telescopes Future Technology The Spitzer Space Telescope
Supermassive Black Holes
Starbursts James Webb Space Telescope
Big Bang to the Milky Way Collisions It harms us only if an explosion occurs Gravitational Pull The night sky will change Hypothesis: The Milky Way will collide with Andromeda (2.5 million ly away) 4.5 Billion Years! And now... a nice video to watch! Round Shape
Only contain gas and dust
Stars are not bright (ultraviolet rays)
Don't have a galactic disk
60% Thank You for watching! Credits Google Images DK Space Encyclopedia NASA Web Site Youtube Father of the Big Bang How Galaxies Work Ancient Technology Use Galaxy Size Big Bang Theory Galaxy Parts The Galaxy Song By Ludi Rizzo Italy England Spain & Portugal France Germany Austria Mesoamerica Brazil Venezuela Peru Columbia United States of America Works Cited Couper, Heather, and Nigel Henbest. DK Space Encyclopedia. New York: DK Pub., 1999. Print.
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Loewenstein, Michael, and David Marsden. "Average Galaxy Size." Imagine The Universe. N.p., 5 Dec. 2000. Web. 13 Feb. 2013.
Masetti, Maggie. "NASA - James Webb Space Telescope." NASA. N.p., 20 Feb. 2013. Web. 22 Feb. 2013.
Ridpath, Ian, and Amie Gallagher. Stars and Planets. New York: DK Pub., 1998. Print.
Simon, Seymour. Our Solar System. New York: Morrow Junior, 1992. Print.
"What Are Galaxies." Galaxies. N.p., n.d. Web. 27 Feb. 2013.
"White Holes." Universe Today RSS. N.p., n.d. Web. 14 Feb. 2013.