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Stars, Galaxies, and the Universe

Stars, Galaxies, and the Universe. Carin Miranda Smyrna Middle Winter 2010. Stars. Stars are made up of gases. When different stars are different colors it means they have a different temperature. Blue-hottest Red-coolest. Stars. The sun is a main sequence star.

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Stars, Galaxies, and the Universe

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  1. Stars, Galaxies, and the Universe Carin Miranda Smyrna Middle Winter 2010

  2. Stars • Stars are made up of gases. • When different stars are different colors it means they have a different temperature. • Blue-hottest • Red-coolest

  3. Stars • The sun is a main sequence star. • A star begins as a ball of gas and dust pulled together by gravity.

  4. Classifying Stars

  5. Sequence of Star’s Life • Main SequenceRed GiantWhite Dwarf • The H-R diagram shows the relationship of a star’s surface temperature and its absolute magnitude. • A white dwarf is is a star that has used up all of its hydrogen and is the leftover center of an older star. • Class F stars are yellow-white • The majority of stars in our galaxy are main sequence stars.

  6. Galaxies • Scientist study distant galaxies because it takes a long time for light to travel through space and to learn what early galaxies looked like. • Edwin Hubble has identified three major types of galaxies: • Spiral (our Milky way) • Elliptical • Irregular

  7. Formation of the Universe • According to the big bang theory, the universe is about 13.7 billion years old. • According to the big bang theory, cosmic background radiation filled the universe after the original explosion.

  8. Formation of the Universe • The universe is expanding outward. • Scientists think that the universe will expand forever.

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