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One lens was concave(curved inwards on both sides)the other was convex(curved outwards on both sides).light rays that travel through a curved lens change direction.

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Over the years there have been many improvements ,for example combining differently shaped lenses using different sorts of glass and combining mirrors and lenses.

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Galileo realised that in war times it would great if you could see your enemies before they could see you.

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The longer the telescope the clearer the image

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Galileo became famous because he was the first person ever to see sun spots around Jupiter.

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One of the strange and beautiful thigns about looking through a telescope is that as you look into the distance you are also looking back in time!

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The first time used "first light

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first light came from early telescopes that consisted of two glass lenses in a tube.

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One of the strange and butifull things about looking through a telscope is that, as you look into the distance, you are also looking back in time.

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If a star is 500 light years away it's light has taken 500 years to reach us

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Galileo Galilei realised that if he used the telescope in the times of war you could see your enemies before they could see you

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1 strange and beautiful things about looking through a telescope is that, as you look into the distance, you are also looking back in time!

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I am awesome

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In 1990, The Hubble Space telescope with its 2.5-metre mirror was launched into orbit 600 kilometres above earth's surface, well beyond the atmosphere.

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In 1990, the Hubble space telescope, with its 2.5-metre mirror, was launched into orbit 600 kilometres above earth surface.

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A curved mirror makes reflected images bigger

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Galileo Galilei was a famous mathematician who lived from 1564 to 1642

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The telescope was first used as a fun way to spy on your neighbours

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In those days,mirrors were made of special type of copper that had to be polished every few day.

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The first telescopes were sold as toys

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when a telescope is used for the first time the image it makes is called first light this effect is called refraction the lenses in a telescope are shaped so that they refract light. the first telescopes that were made were sold as toys.Galileo was a famous mathematician who lived between 1564 and 1642.

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Galileo invented a telescope that used curved mirrors rather then lenses.

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The first real telescope was 46 metres long

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The first telescopes were sold as toys.