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1. Give an account of all the planets in the solar system.
  
Mercury:
Mercury is the nearest planet to the Sun. It is the . This rocky planet looks in colour. It is considered the since it revolves around the Sun in .
 
Venus:
Venus is the neighbour planet of Earth which does not have any of its own. Venus is said to be the  due to their similarities in size and surface composition of Earth. It appears in colour.
 
Venus rotates in the  direction. This planet completes its rotation in 243\ days, and the period of revolution is .
 
It is the in the solar system because it has a composed of . These gases in the atmosphere  the heat falling on the planet and retain it inside.
  
Hence, it appears as the  planet and are called a .
 
Earth:
Earth is the only planet where  is known to exist. The factors responsible for the existence of life on Earth are
(i)
(ii)
(iii)
(iv)
 
The Earth appears from space due to the  from the water and the landmass on the Earth surface.
 
The Earth's axis is tilted to a side by  degrees and completes its rotation from  in 24\ hours.
 
Mars:
Mars is the  planet and the in the solar system. The period of revolution is  days.
 
Mars is generally called the as it appears in colour. This colour is due to the , which is present on its surface.
 
Mars has two natural satellites, namely , out of which  is smaller.
  
Jupiter:
Jupiter is the  planet and the first gaseous giant after the . This Jovian planet was discovered by .

Jupiter has  faint rings around it and appears .  is the largest natural satellite in the solar system.
 
The is a huge massive storm that swirls around in the  direction at a speed of more than 400\ km/h.
 
Saturn:
The planet, Saturn appears . The period of rotation is  hours.

Saturn is also known as the . The  rings of Saturn are made up of . The planet has around moons.  is the largest natural satellite of this planet.
  
Saturn has the compared to the other planets. The planet's density is  times lesser than Earth.
 
Uranus:
The seventh planet, Uranus, appears . Being the third biggest giant, Uranus is surrounded by faint rings with natural satellites revolving around it.
  
Uranus has a  which makes planet appear to spin on its side. It has the , each lasting around years.
 
Neptune:
The planet, Neptune, is  in colour. This last ice giant is made up of  in liquid form. No life can exist on this . The period of rotation is  hours.
 
Neptune is the  planet, with  satellites revolving around it.  is its largest natural satellite and the only moon in the solar system that orbits in the opposite direction of the planet's spin.