Astronomy part 4

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Astronomy part 4
2015-04-21 21:38:36
Astronomy part
test 3
Show Answers:

  1. According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
    Because only metal and rock could condense in the inner solar system, while ice also condensed in the outer solar system
  2. What is the giant impact hypothesis for the origin of the Moon?
    The Moon formed from material blasted out of the Earth's mantle and crust by the impact of a Mars-size object
  3. How much radioactive potassium-40 will there be after 2 halflives pass (one halflife is 1.25 billion years )?
    3 micrograms
  4. How much of its decay product (argon-40) will be present in the rock at that time (after 2 halflives)?
    9 micrograms
  5. About how old is the solar system?
    4.5 billion years
  6. Which planet listed below has the most extreme seasons?
  7. In what way is Pluto more like a comet than a planet?
    It is made mostly of rock and ice.
  8. Which moons are sometimes called the Galilean moons?
    The four largest moons of Jupiter: Io, Europa, Ganymede, and Callisto
  9. Astronomers now classify Pluto as really just a large member of
    the Kuiper belt.