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  1. Why do you think the Hubble Space Telescope is sometimes called a “time machine”? (See answer)
  2. Why do astronomers want to study the very distant galaxies seen in the Hubble Ultra Deep Field ?
    (See answer)
  3. Suppose a new star is seen in the sky today. Scientists announce that it was born on your birthday, but they saw it today for the first time. Based on your age and the distance light travels in a year (called a "light-year"), how far from Earth is the star?
    (See answer)
    (One light-year, converted to miles:
    1 light-year = 5,900,000,000,000 miles = 5.9 trillion miles.
    One light-year, converted to kilometers:
    1 light-year = 9,500,000,000,000 kilometers = 9.5 trillion kilometers.)
  4. Look at the close-up from the Hubble Ultra Deep Field. All of the points of light in the photo are galaxies. Write down three questions you would ask an astronomer about the galaxies in this image. (See answer)