The Planet Earth and The Solar System

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Across
  1. 2. Rocky space objects that orbit our Sun.
  2. 4. The group of stars which are recognised by their formations.
  3. 6. The day when moon is completely visible to us.
  4. 7. the smallest planet in our Solar System.
Down
  1. 1. Scientists who study celestial bodies.
  2. 3. The only natural satellite of the Earth.
  3. 5. They are self-luminous heavenly bodies.
  4. 7. It is also known as the Red Planet.