Stars and the Solar System

• All natural objects in the sky are celestial objects.
• The Moon
  • New Moon day → when moon is not visible
  • Full Moon day → when full moon is visible
  • Gap between consecutive new moon day and full moon day is of 15 days.

• • Rotational period and revolution period of moon are the same (almost 29 days).

• Moon’s surface
  • Because of lack of atmosphere, one cannot hear any sound on moon.

• The Stars
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