Solar System- Earth and Universe- Archenhaud

When we look up in the sky it seems that it’s flooded with stars. It might fascinate many of us that many of the stars are even larger in size than others on earth. The stars occur in clusters in space. The cluster of stars is known as Galaxies or nebulas. There are around a hundred million stars in each Galaxy. Our Earth is in the Milky Way galaxy which alone has more than 100000 million stars. The solar system comprises of sun and eight planets. These planets have been developed from the condensation of gases and various bodies. All these eight planets revolve in elliptical orbits. Distance traveled by light in one year is known as light year Sun rays take around 8 minutes to reach the surface of Earth. Lights from many stars take around four years to reach our surface.

The solar system

Among the eight planets, Mercury is the closest. It is the hottest planet and takes around 88 days to make one Revolution around Sun. Next to mercury is Venus. Venus is after known as Earth’s twin because of its resemblance in size, shape, mass, and density. The third planet is Earth. Earth is the only planet that supports life and hence is known as Goldilocks. Like many other planets, Earth also has one natural satellite, Moon. The fourth planet in the solar system is Mars. It is often referred to as Red Planet due to the presence of ferric oxide on its surface.

Next to Mars is Jupiter. It is one of the largest planets in our solar system. Since it’s at a far distance away from the Sun, its surface is very cold. The surface of Jupiter is made up of Hydrogen, Helium, and methane gases. Jupiter alone has 12 satellites that orbit around it. After Jupiter, next is Saturn. Saturn is the only planet in the solar system that has three rings and 9 satellites around it. After Jupiter, Saturn is the second-largest planet in our solar system. The seventh planet is Uranus. It has a total of five satellites revolving around it. The outermost planet in our solar system is Neptune Neptune has only to known satellite and is probably the much colder planet in our solar system.

All the planets revolve in an anticlockwise direction except Venus and Uranus which revolve from east to west.


The moon revolves around Earth in an elliptical order it takes around 27 days to complete its one Revolution. The axis of the moon is inclined at an angle of 58’4″ whereas an axis of the earth is inclined at 23’5″. When the moon is closest to the earth It is known as the perigee and when it is farthest from the earth it is known as apogee.

Why Pluto was referred to as a dwarf planet?

All the planets in our solar system revolve in a fixed elliptical Orbit except Pluto. In a recent Discovery, it’s found that Pluto enters the Neptunes orbital path. When Pluto is closest to the sun it is known as perihelion and when it is farthest from the sun it is known as aphelion.

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