What are planets
Planets are defined as the asteroids which are revolving around any star like in our solar system there are nine asteroids Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto which are revolving around a star that is the Sun. So we call those asteroids as planets. The Earth on which we live is one of nine planets that move round and round the sun.
Why do all the planets look different
There are nine planets in our solar system and all the planets look different from each other. The reason of each planet to be looking different is that each one seems to be made up of different substances. Even though the all are planets revolving around the sun and part of the solar system, their composition varies. We actually know very little about what the planets are made of, and this is one of the questions man hopes to answer with the space explorations that have taken place and those that are being planned for the future. Let’s take a brief look at each of the other planets and see what is known of their make-up. Mercury is a small, rocky world. It has some dark areas and many craters on its surface, but has no atmosphere or water of any kind. Venus is a white globe with some hazy markings. It is completely covered by a layer of white clouds, which are not made of water vapor but of concentrated sulphuric acid. Underneath its clouds, Venus’s atmosphere is made largely of unbeatable carbon-dioxide gas. This traps heat from the sun like a blanket, so temperatures at the planets surface reach nearly 500 degree Celsius and there is scarcely any water on Venus. Mars is known as the red planet because of the color of its deserts. It is half the size of the earth and has thin atmosphere of carbon-dioxide in which clouds form. No definite signs of life have been found on Mars, perhaps because it is very cold there. Jupiter appears as yellowish globes with colorful bands of clouds swirling around it and a giant red spot clearly visible in the clouds. It is a giant ball of liquid, mostly hydrogen and helium, becoming denser and denser towards the planet’s centre. Saturn is mostly liquid hydrogen with a set of brilliant rings around it. These are made of countless particles all moving in orbits around the planet like miniature moons. Uranus has rings around it too, though these are much darker than Saturn’s. Neptune is a dim greenish object and Pluto is the smallest planet in the solar system, smaller even than our own moon. It has an eccentric orbit that sometimes brings it closer to the sun than Neptune. Exploration of space by satellites and probes is helping scientists learn more about the other members of the solar system.