Space Homework Year 5 English Test

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It takes just over 365 days for the Earth to travel all the way around the Sun. We call the length of time it takes to go around the Sun a year, but to make life easier, most years have 365 days and every 4th year has 366 days. We call a year with 366 days a leap year. The extra day is February 29th. 2012 was a leap year, and 2016 and 2020 will be leap years.

The same force that holds you on the surface of the Earth so that you don’t float away when you jump, is what keeps the Moon revolving around the Earth and the Earth revolving around the Sun. This force is called gravity and the first man to discover that it existed was Sir Isaac Newton in the 17th century – he saw an apple fall from a tree and realised that it must have been pulled by a force.

Earth is the only planet on which we know that there have been plants and animals living. On some planets there is no air to breathe and on others it is either too hot or too cold. Some scientists think that creatures may have lived on Mars millions of years ago, when Mars was warmer and had more air – they try to find evidence to show this is true.

Until 2006, people thought that there were nine planets in the Solar System. The ninth planet was Pluto and it is even further away from the Sun than Neptune. Astronomers decided that Pluto was too small to be called a planet, so now there are only eight planets.

The Sun is a star, it is a huge ball of very hot gas. The temperature of the Sun is around 5,500°C – it’s so hot that you can feel the heat from it on Earth, millions of miles away, and see by the light that it gives out. The Sun is about 4.5 billion years old and will last until it is about 10 billion years old.

There are more than 100 billion stars in the Milky Way and there are many different types of star. Our Sun is of a type called a “yellow dwarf”. Scientists group stars together by how big they are and how bright they are. Some examples are red dwarfs and supergiants. A red dwarf is a star about half the size of the Sun and a lot less bright than the Sun. A supergiant star is about 70 times as big as the Sun and can be 100,000 times as bright.

The nearest Star to the Earth after the Sun is Proxima Centuri. It is red dwarf that is smaller and colder than our Sun and gives off a lot less light. Even though it is the closest star outside the Solar System, the light from it is too faint to see except with a telescope. Proxima Centuri is 24 trillion miles from Earth and light from it takes four years and three months to reach Earth.

The planets

Mercury – this is the closest planet to the Sun. It is the smallest planet and is made of rock. It is so close to the Sun that it only takes 88 days for it to complete its orbit and is much hotter than Earth.

Venus – Venus is the next planet from the Sun after Mercury. It is also made of rock. Like Earth, Venus has an atmosphere (air) around it, but it is a lot thicker than Earth’s and Venus is permanently covered in clouds. Venus is the hottest planet and has an average temperature of 460°C. It is about the same size as Earth. It takes 225 days to travel around the Sun.

Earth – This is where we live! Earth is made of rock and is the only planet where water is liquid. The other planets are either too hot or too cold. Earth takes 365 days to travel around the Sun.

Mars – Mars is a little smaller than Earth, but a lot further out. It used to have an atmosphere like Earth and Venus, but it doesn’t have very much anymore. Mars is reddish in colour and is sometimes called ‘The Red Planet’. Mars takes 687 days to complete its orbit and the average temperature is -63°C.

Jupiter – Jupiter is the largest planet in the Solar System. You could fit 1,321 Earth’s inside Jupiter. It is made of gas and is one of the four ‘gas giants’. Jupiter has 66 moons, one of them, Ganymede, is bigger than Mercury. Jupiter is five times as far from the Sun as the Earth is and takes almost 12 years to travel around the Sun.

Saturn – Saturn is famous for its rings. The rings were discovered in 1610 by Galileo and are made up of huge numbers of small lumps of ice and dust (mostly ice). The pieces in the rings may be as small as a millimetre or as large as a few metres across. Saturn is the second largest planet in the Solar System and is another one of the ‘gas giants’ like Jupiter. It takes 29.5 years to travel around the Sun.

Uranus – Uranus is another of the ‘gas giants’. You could fit 63 planets the size of Earth inside Uranus. Uranus takes 84 years to orbit the Sun and is the coldest planet, with an average temperature of -220°C.

Neptune – Neptune is the farthest planet from the Sun. It is 30 times as far from the sun as Earth and takes 165 years to travel around the Sun. Neptune is the last of the four ‘gas giants’ and is 58 times the volume of Earth.

Words to know:

Asteroid – Asteroids are bodies of rock and ice in space. Millions of asteroids orbit the Sun -most between Mars and Jupiter. They vary in size between 1 metre across and 600 miles across.
Atmosphere – the layer of gas around a planet
Comet – a comet is a body of ice, dust and bits of rock that passes through space leaving a tail of ice and dust behind it. A comet may be up to 25 miles across.
Day – the length of time it takes the Earth to spin all the way around so that you get a night and a day – 24 hours
Galaxy – a large group of stars, all orbiting a central point.
Gravity – the force that attracts a moon to a planet, or a planet to a star
Light Year – the distance that light travels in one year. 5.9 trillion miles
Meteor – a small piece of debris in space, up to the size of a boulder
Milky Way – the galaxy that we live in
Moon – A moon is a smaller object orbiting a planet. Some planets have many moons. Earth has just one, called The Moon.
Orbit – the path that a planet takes around the Sun, or that a moon takes around a planet
Planet – a large body of either rock or gas that follows a consistent orbit around a star
Shooting star – This isn’t really a star! A shooting star is a meteor that is passing through the Earth’s atmosphere and has got so hot that it glows in the night sky.
Solar System – the Sun and the collection of stars
Star – A star is a huge ball of very hot gases, that gives off lots of light and heat. Some stars have planets orbiting around them, but not all do.
Sun – the star in our Solar System
Universe – The Universe is everything that exists – all the galaxies, all the stars, all the planets and everything in between
Year – the length of time it takes the Earth to travel around the Sun – 365 days


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