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The universe is a large vacuum with many galaxies, rocks and stars. The galaxy we live in is called the milky way galaxy. It may seem very big but it’s not. Really it’s just one of the millions and millions of galaxies out there. There is still way more to explore beyond our solar system.

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The Sun is the star at the centre of our solar system.

It is an almost perfect sphere of super-hot gases whose gravity holds the solar system together.

The temperature inside the Sun can reach 15 million degrees Celsius.

The Sun is composed of hydrogen (70%) and Helium (28%).

Energy is generated at the Sun’s core, by nuclear fusion, as Hydrogen converts to Helium.

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Explore National Geographic. A world leader in geography, cartography and exploration.

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It’s the 1st planet in our solar system

It’s just a little bigger than Earth’s moon

Mercury is the smallest planet in our solar system

It is a terrestrial planet

A day on Mercury lasts 59 Earth days.

A year on Mercury lasts 88 Earth days.

Mercury does not have any moons.

Venus is Mercury’s neighbouring planet

It is 69.165 million km away from the sun

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It’s the 2nd planet in our solar system

Venus is similar in size to Earth

Venus is the hottest planet in our solar system

It is a terrestrial planet

Its rotation is very slow

One day lasts 243 Earth days

One year lasts 255 Earth days

Venus doesn't have any moons

Mercury and Earth are Venus's neighbouring planets

It is 108.04 million km away from the sun

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It’s the 3rd planet in our solar system

It’s our one and only beautiful home

It is a terrestrial planet

Water covers 70% of Earth's surface

The atmosphere protects us from incoming meteoroids

A day on Earth lasts a little under 24 hours.

One year lasts 365.25 days. That 0.25 extra means every four years we need to add one day to our calendar. We call it a leap day (in a leap year)

Earth has just one moon

Venus and Mars are Earth’s neighbouring planets.

It's 150.5 million km away from the sun

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It’s the 4th planet in our solar system

Mars is sometimes called the Red Planet.

It has a very thin atmosphere made of carbon dioxide, nitrogen, and argon.

Mars is a terrestrial planet.

One day lasts 24.6 hours

One year is 687 Earth days

It has 2 moons called Phobos and Deimos

Earth and Jupiter are its neighbouring planets

It's 209.67 million km away from the sun

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It's the 5th planet in our solar system

Has a big storm called the great red spot

Is a gas giant

Has very faint rings

The biggest planet in our solar system

One day is 10 hours

One year is 11.8 earth years

Has 79 confirmed moons

Mars and Saturn are its neighbouring planets

It's 768.54 million km away from the sun

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It's the 6th planet in our solar system

It has 7 big rings made of rocks and ice

Is a gas giant

One day is 10.7 hours

One year is 29 earth years

Has 53 moons and still 29 more to be confirmed

Jupiter and Uranus are its neighbouring planets

It's 1.4937 billion km away from the sun

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It's the 7th planet on our solar system

Methane makes it blue

It rotates on its side

Has 13 faint rings, the outer rings are easier to see

Is an ice giant

One day lasts 17 hours and 14 mins

One year lasts 84 earth years

Uranus has 27 moons

Saturn and Neptune are its neighbouring planets

It's 2.9598 billion km away from the sun

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It's the last planet in the solar system

It's similar to Uranus

Has 6 rings

Is an ice giant

Is very cold with a thick windy atmosphere

One day is 16 hours

It takes 165 earth years to go around the sun

Has 14 moons

Uranus is the only neighbouring planet

It's 4.4763 billion km away from the sun

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The moon is the easiest celestial object to find in the night sky — when it's there

It takes 27.3 days both to rotate on its axis and to orbit Earth.

It’s bigger than Pluto

Daytime temperatures on the sunny side of the moon reach 134 degrees Celsius; on the dark side, it gets as cold as  -153 degrees Celsius.

This is a video explaining different theories about the moons formation:

https://www.space.com/55-earths-moon-formation-composition-and-orbit.html?jwsource=cl