Star
• Clumps of dust and gas in a nebula come together due to gravity and form
Stars are made of hot burning gases.
• They emit light of their own and are very large and very hot.
• Light takes about 4.3 years to reach us from the next nearest star proxima Centauri.
The Solar System
and thousands of other smaller heavenly bodies such as asteroids, comets and meteors.
The sun is at the centre of the solar system and all these bodies are revolving around it.
The gravitational pull of the sun keeps all the planets and other objects revolving round it. Thus, the motion of all the members of the solar system is governed mainly by the gravitational force of the sun.
Planets revolve around the sun in elliptical orbit.
In the solar system the planet nearest to the sun is Mercury and the
planet farthest from the sun is Neptune (not Pluto).
The size of solar system has been estimated to at about 105 AU.
The solar system is dominated by the sun which accounts for almost 999% of the matter in the whole solar system.
The sun is also the source of aill the energy in the solar system.
Pluto is a dwarf planet.
Mercury, Venus, Earth, Mars are called terrestrial planets and Jupiter,Saturn, Uranus and Neptune are called gaseous planets and
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