The Sun occupies the centre of the solar system, the Earth is one of the eight planets revolving around it. The Earth is the planet that we live on, The ozone layer protects living...
Planets revolve around the Sun in fixed orbits due to the attraction force of the Sun to the planets. Mercury, Venus, Earth and Mars are called the inner planets because they are the nearest...
The crossing star theory (Chamberlain and Moulton 1905) The assumptions of the crossing star theory assumed that the solar system was originally the Sun, A huge star approached to the Sun, This star attracted...
The Solar Nebular Model Astronomers think that the most widely accepted model for explaining the evolution and formation of our solar system is ” the Solar Nebular Model ” which states that the planets...
The solar system the solar system consists of the Sun ( star ) , Eight planets ( revolving around the Sun in fixed orbits ) , the comets , the asteroids and the moons...
The Universe The universe is the wide and extended space that contains all the galaxies , the stars , the planets , the moons , the living organisms , and everything , The universe...
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