Astronomy quizlet exam 1

  • Four planets are within about 20 meters of the Sun, while the rest planets are spread much farther apart.
    If you could count stars at a rate of about one per second, how long would it take to count all the stars in the Milky Way Galaxy? The total number of stars in the observable universe is about: A) 100 billion.
  • How long does it take for Earth to make one revolution around the Sun? It takes Earth one year or about 365 days to revolve around the Sun.
  • How long is the precession cycle? 26,000 years.
    The place the Sun stops its northward motion along the ecliptic is the: Summer solstice.
  • The Sun's age can be estimated from the ages obtained from radioactive dating of the oldest meteorites.
    Scientists look for the oldest things we can find.
    Moon rocks are the oldest.
Rating 5.0 (2) Study with Quizlet and memorize flashcards containing terms like What is a star?, What is a planet?, What is a moon? and more.,Rating 5.0 (2) What is the Cosmic Calendar? The cosmic calendar is a scale on which we compress the history of the universe into 1 year.
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