Planets of our Solar System
- There are eight planets in our solar system. ( Excluding pluto which now is a dwarf planet ).
- The sequence of planets according to their distance from the sun is
- The sequence of planets according to their size (in descending order i.e. from big to small) is
- A hypothetical ninth planet has been recently discovered by NASA named Carla.
- Planets are classified into the two groups – inner and outer planets
|Inner planet||Outer planet|
|They are called as terrestrial or rock planets. They are nearer to the Sun.||They are called as Jovian or Gaseous. planets. They are far away from the Sun.|
|They include: Mercury, Venus, Earth and Mars||They include: Jupiter, Saturn, Uranus and Neptune.|
- Nearest planet to Sun.
- This planet has no gas water or gases on it.
- Since Mercury does not have any atmosphere, it’s day is very hot whereas night is very cold.
- Period of Rotation (Day) : 58 Earth Days, Period of Revolution (Year) : 87 Earth days.
- Nearest planet to Earth.
- Brightest Planet.
- Also known as “Evening Star” as well as “Morning Star”.
- Known as the “Veiled Planet”.
- Also known as the “Earth’s twin” or Earth’s sister planet
- This planet rotates clockwise like Uranus.
- Hottest planet of Solar System.
- Venus has no water on it.
- It has the densest atmosphere of the four terrestrial planets. The atmospheric pressure at the planet’s surface is almost 92 times that of Earth.
- A day on Venus is equivalent to 243 earth days.
- A year on Venus is 224 earth days. Venus’s day last longer than it’s year.
- Period of Rotation (Day) : 243 Earth Days, Period of Revolution (Year) : 224 Earth days.
- Known as “Blue Planet” and “Watery Planet” .
- This is where we live. 🙂
- Earth is the only known planet which provides sustenance or life on it.
- The earth has a lot of water in the form of lakes, rivers and oceans for the growth and survival of life.
- The earth has enough oxygen gas in its atmosphere for the survival of living beings through breathing.
- It has one natural Satellite – names “Moon”.
- Because of its Iron-rich red soil and pink sky, it is also know as “Red Planet” .
- Phobes and Demos are two satellites of Mars.
- Mars is named after Roman god of war.
- Mar’s Olympus Mons (shield volcano), is the largest volcano and the highest known mountain (24 km) in the Solar System.
- Period of Rotation (Day) : 1.025 days Earth Days, Period of Revolution (Year) : 687 days Earth days.
- largest planet in the Solar System.
- It is composed mostly of gas and liquid swirling in complex patterns with no solid surface.
- Jupiter has 79 moons ( Natural satellite ).
- Natural satellite of Jupiter named, Ganymede, is the largest satellite in the Solar System.
- Galileo discovered four satellites of Jupiter including Ganymede (Europa, Ganymede, and Callisto ).
- Jupiter is also known as Winter Planet because of it’s low average temperature.
- Rotation speed of Jupiter along it’s axis is very high because of it the planet’s shape is that of an oblate spheroid (slight bulge at the equator).
- Period of Rotation (Day) : 9.9 Earth hrs, Period of Revolution (Year) : 11.9 Earth Years.
- Saturn has bright concentric rings which are made up of ice and ice-covered dust particles which revolve around it.
- After recent discovery of few satellites of Saturn, now in solar system, Saturn has most number of discovered natural satellites.
- Titan is the largest satellite of Saturn and second largest satellite of solar system.
- Period of Rotation (Day) : 10.7 Earth hrs, Period of Revolution (Year) : 29 Earth Years.
- Uranus is about four times the size of the Earth.
- This planet appears Greenish in colour because of methane gas present in
- Uranus is the first planet to have been discovered by the use of a telescope.
- Like Venus, Uranus also rotates from east to west ( which is opposite to other planets ).
- The axis of Uranus has large inclination so that it appears to be lying down hence it bears the name “A Planet on its Side”.
- Period of Rotation (Day) : 17 Earth hrs, Period of Revolution (Year) : 84 Earth Years.
- Neptune is very similar to Uranus and can be considered as its twin.
- In Solar system this is the farthest planet from Sun.
- Period of Rotation (Day) : 16 Earth hrs, Period of Revolution (Year) : 164 Earth Years.
Dwarf planets of solar System
- There are 5 officially recognized dwarf planets in our solar system, they are
- Makemake and
- With the exception of Ceres, which is located in the asteroid belt, the other dwarf planets are found in the outer solar system.
- As per the plant definition of IAU (International Astronomical Union), Pluto is no longer a planet from August 24, 2006. It’s now a Dwarf planet.
- It is the largest dwarf planet of solar system.
- Charon is Pluto’s largest moon.