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  • Fill in the blanks: The_____ ______on Mars make it look red.
    iron oxide
  • Give an example of a Star.
    Sun (or other appropiate answers)
  • Name the 8 planets of the Solar System.
    Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
  • Astronomical objects can be classified into what 3 types?
    Stars, Planets, Satellites
  • Fill in the blanks: Venus is surrounded by a thick_____,so a strong______effect is produced. The average surface temperature is very_____.
    atmosphere, greenhouse, high
  • Tell me about the characteristics of a Star.
    - illuminating - emitting heat
  • Tell me the charateristics of a Satellite.
    - non illuminating - revolving around a planet
  • What does Light-year refer to?
    It refers to the distance that light travels in 1 year
  • Are Saturn's halos obvious?
    Yes
  • What is the unit of astronomical distances?
    Light-year
  • Tell me the characteristics of a Planet.
    - Non-illuminating - revolving around a star
  • Which planet has the largest number of satellites?
    Jupiter
  • How many Sun-like objects are there in the Milky Way?
    200 to 300 billion
  • Fill in the blanks: Mercury is the nearest planet to the_____.It is full of_____, created by_____on the surface.
    Sun, craters, meteorites
  • The Solar System is one of the what in the Milky Way?
    Planetary system
  • Fill in the blanks: Earth is protected by the______.It is the only known planet with the existence of _______in the Solar System.
    atmosphere, high intelligent living things
  • Give an example of a satellite.
    Lo (or other appropiate answers)
  • Give an example of a Planet.
    Earth (or other appropiate answers)
  • When was the universe created?
    Scientists estimate that it was created 13.8 billion years ago
  • The Milky Way is one of the what in the universe?
    Numerous galaxies
  • How was the universe formed?
    By a large explosion
  • What is the basic unit composing the universe?
    The galaxy
  • The Earth is one of the what in the Solar System?
    Astronomical Object
  • The radius of Milky Way is about how many light years?
    100 thousand light-years
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