Solar System

What is a Solar System?

Imagine the Universe as a huge ball, in that ball imagine that there are billions of other smaller balls we call these Galaxies, and inside those galaxies, there are billions of stars, and our Sun is one of those stars, the gravity that each of these stars emits will make so that multiple objects or planets will orbit that star which will create a Solar System

How big is our Solar System Sun?

Our sun is 864 000 miles (1 392 000km) in diameter, in comparison our planet’s diameter is 12 742km (7917 miles) which makes the sun 109 times wider than the earth, to put it into perspective, if the sun was a door, then the earth is a coin under that door that you can barely see. 

Planets in our Solar System from the Smallest to the Biggest 

There are 8 planets, 146 moons and a bunch of dwarf planets which are not part of the solar system but are pretty close, for example, Pluto, the 8 planets that are included in the solar system however are called: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. This was ranked from closest to farthest from the sun. 

Now the order from Smallest to Biggest planets in our Solar System: 

Mercury (Smallest in the Solar System)

Planet Mercury

Mercury has a radius of 1,516 miles, making the Earth 3 times bigger than Mercury and slightly bigger than our Moon’s size. 

It is also the closest planet to the Sun and can make a full orbit around the sun in just 88 Earth Days compared to the earth which makes a full turn in 365 days. 

Contrary to the Earth, Mercury is mainly an iron Planet which creates an amazing reaction with the sun, the side that is facing the sun is very hot and can reach temperatures of around 427℃ (or 800℉), but the other side which is not facing the sun yet and has a shadow on it like in the picture above is the opposite and has a temperature of -173℃ (or -280℉) which makes this planet uninhabitable for humans. 


Planet Mars in our Solar System

Mars is the second smallest planet in our solar system, it is also the most famous planet to us as it has always been associated with extraterrestrial life in movies and so on, Mars has a radius of 2,106 miles which is half the size of our planet, this planet takes twice the time our planet takes to orbit the sun meaning that one year in Mars is 730 days. 

Mars is much colder than the earth as it is further away from the sun than we are, the temperature there ranges from −143°C (or −225°F) to 35°C (or 95°F). 


Planet Venus

Venus is the third smallest planet in our solar system, but comes right after Mercury in terms of closeness to the sun, even though it is the second closest to the sun, it is nevertheless the hottest planet in our solar system because the planet has a high density of carbon dioxide which traps the heat from escaping making the temperatures rise up to a 475°C (or 900°F). 

Venus is also the closest planet to our earth and is just slightly smaller than it, with a radius of 3,760 miles. 


Planet Earth in our Solar System

Earth comes in the middle position and is also the 3rd closest planet to the sun right after Venus, it has a radius of 3,959, earth is also the only planet known to have life in it, the only one with water and the only planet that have seen several destructions and rebirths across its 4.5 billion years of life. 


Planet Neptune in our Solar System

Neptune is 4 times bigger than the Earth. It has a radius of 15,299 miles and is also the 4th biggest planet in our solar system. 

Neptune is one of two planets that are called “Ice giant”, it takes 165 Earth years for Neptune to complete one turn around the sun because of how far it is from the sun and how slow it moves. 

This planet has 14 moons, and its atmosphere is mainly made of Helium and Hydrogen. 


Planet Uranus

Uranus is the 2nd Ice Giant and is roughly the same size as Neptune with a radius of 15,759 miles, it is also the 7th planet in terms of distance from the sun, and to complete one rotation around the sun it takes 84 Earth Years 

This planet has 27 moons, and is also the coldest planet in the solar system with its lowest temperature falling to −224°C (or −371°F). 


Planet Saturn

Saturn is the second-largest planet in our solar system, it is one of two planets that are called “Gas Giant”, with a radius of 36,184 miles, nearly 9 times bigger than our planet. 

This planet’s density is much lesser than the Earth because it is mainly made up of gas, but its volume is so big that it can take up 763earths in it. 

Saturn takes more than 29 Earth years to orbit the sun once time, has 82 moons and is famous for its complex and multiple rings surrounding it. 

Jupiter (Biggest in the Solar System)

Planet Juptier in our Solar System

Jupiter is the biggest planet in our solar system and the 5th farthest planet from the sun. It has a radius of 45,441 miles, which is equivalent to 11 times the size of the Earth. 

It is also the 2nd “Gas Giant” it has a mass that is significantly more than the combined mass of all the other planets in the solar system. Jupiter takes 11.86 Earth years to complete its orbit around the Sun. 

It has 79 moons and an atmosphere that is mainly composed of hydrogen and helium. It is known for its Great Red Spot which is even bigger than Earth as a planet. 

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