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The solar system is made up of all the planets that orbit our Sun .In addition to planets; the solar system also consists of moons, comets ,asteroids, meteoroids, minor planets ,dust and gas. Everything in the solar system orbits or revolves around the Sun. The eight planets are --- Mercury , Venus , Earth , Mars , Jupiter , Saturn , Uranus and Neptune.
The twinkling spots of lights that we see in the sky at night are called stars . There are billions and billions of stars in the universe . Stars are self-luminous celestial bodies . They are huge balls of very hot gaseous matter that emit heat and light . The Sun is the star nearest to the Earth . Stars are formed from huge clouds of dust and gas .
Stars are found in very large clusters or groups . These clusters are called galaxies . A galaxy consists of group of groups of stars , dust , gas and other matter , bound together by a force called gravity .
There could be several million stars in a galaxy . All the galaxies together make up our universe .
Constellations When seen from the Earth , some of the stars in the sky appear to be arranged in reconisable patterns . Some look like animals , some like people , while some look like objects . These patterns stars appear to make in the sky are called constellations .
There is no air , water , wind , rain or snow . The Moon has no atmosphere . There is no life on the Moon . The surface has mountain and plain lands. There are big holes called craters . These were made by meteors .
The Moon does not have light of its own and reflects only the light that falls on it from the Sun . Moon does not change its shape at all . As it keeps on revolving around the Earth ,we see different parts of it lit up . This causes different shapes of the Moon called Phases of the Moon .
Planets A planet is a celestial body that orbits a star . All the planets are spherical in shape . They are non-luminious , i.e. , they do not produce light of their own . Instead , they reflect the light of the Sun that falls on them . Every planet spins on its own axis is called rotation . One complete movement around the Sun is called a revolution or planet-year.
Mercury , the planet near the Sun and is the second smallest planet in the solar system , only slightly larger than the Earth’s Moon . Mercury’s surface is covered with craters . This tiny planet does not have any rings or Moon .
Mars is the fourth planet from the Sun . Mars bright appearance and reddish color stand out in the night sky . Impressive surface features such as enormous volcanoes and valleys are frequently obscured by huge dust storms .
It is the largest planet in the solar system . When approached from a far , its fantastic striped atmosphere gradually reveals intriguing clouds that move around the planet . Rich in historical and cultural connections . Jupiter is the site of recent comet impacts and continuing scientific discovery .
Uranus , the seventh planet from the Sun , has its spin axis almost in the plane of its orbit about the Sun . This produces unusual seasons and also causes unique magnetic and electric field structures . Uranus has a faint ring system and 27 known Moons .
Neptune , the eighth and farthest planet from the Sun , is a very cold planet Its bluish color is caused by small amount of methane gas in its atmosphere . The planet has 13 Moons and a very narrow , faint ring system .