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SPACE A star (our sun )is part of a galaxy. A planet (earth) orbits a star. A moon (our moon) orbits a planet (earth) SPACE One light year is the distance travelled by light in a year. It takes light from the sun 8 minutes to get to the earth. SPACE It takes 4 light years for light to reach the nearest star (alpha centauri) It takes light 100,000 light years to get to the edge of our galaxy. SPACE There are two types of telescope ,the refractor and the reflector. SPACE The refractor works by light bending or refracting. The reflector works by light reflecting. The Refracting Telescope The refracting telescope consists of two convex lenses. The objective lens collects light from distant objects such as planets and stars. It forms an image of them. The eyepiece lens then magnifies this image. SPACE SPACE Use can be made of light ,radio and micro waves from the electromagnetic spectrum. SPACE Radio waves are detected by large curved dishes similar to the dish aerials in T.V. systems This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.