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Transcript
Learning outcomes: You should • Know the other objects we share our solar system with •Understand how and why telescopes are used in astronomy 1066, the Battle of Hastings Normandy invaded Britain – and won Recorded in the Bayeux Tapestry 70 metres long - includes 623 people, 202 horses, 41 ships and 55 dogs Halley’s Comet? These men wonder at the star 12 BC – the Star of Bethlehem? Periodic comet Visits Earth every 75 -76 years Visible with naked eye Last visit 1986 Next visit 2061 Rock, dust, ice and frozen gases Dirty snowballs Between 500 m and 50 km across Start to melt the closer they get – produces tail Asteroids – left over bits Solid lump of rock 10 – 100 km across Dinosaurs all died Impact on Earth would produce large amounts of debris Blocked out sunlight Collision every 200-300 years 1908 in Russia – 2000km What could we do to prevent this? Telescopes – first used by Galileo 400 yrs ago Magnification – x20 Affected by atmosphere Scatters light Hubble telescope 353 miles In orbit, not affected by atmosphere Not just light – radio waves, microwaves, UV Radio telescope Objects emit radiation in radio wavelength Satellites Detect EM waves that don’t penetrate atmosphere Stars exploding – gamma rays Far off planets – infra red Black holes – nothing A. Earth B. Jupiter C. Pluto D. Venus A. It is closer to the Sun B. It is further away from the Sun C. Acid Rain D. The Greenhouse Effect A. Comet B. Planet C. Asteroid D. Moon A. Iron and nickel B. Strontium C. Hydrogen and helium D. Helium and neon A. Earth B. Venus C. Saturn D. Mars
