Astronomy 3.0 / 5 based on 1 rating ? PhysicsAstronomyIGCSEEdexcel Created by: Lottie BurrCreated on: 12-02-13 17:09 UNIVERSE Large collection of billions of galaxies 1 of 18 GALAXIES Large collection of billions of stars 2 of 18 ASTEROIDS Rocks that orbit the sun between Mars and Jupiter 3 of 18 MOONS Natural satellites that orbit planets due to gravity 4 of 18 ARTIFICIAL SATELLITES Man made objects that orbit planets due to gravity 5 of 18 POLAR SATELLITE Orbit above poles 6 of 18 GEOSTATIONARY SATELLITES Always stay above the same point of the earth 7 of 18 COMETS Lumps of rock and ice, Originate from outer edges of the solar system 8 of 18 ORBIT OF A COMET Highly elliptical, sun is at one end of the foci of the ellipse, comet speeds up when approaching sun as force of gravity is stronger 9 of 18 GRAVITY CAUSES.... Planets and comets to orbit the sun. Moons and artificial satellites to orbit earth. 10 of 18 THE SIZE OF GRAVITY DEPENDS ON... Masses of the objects, the distance between them 11 of 18 IS GRAVITY THE SAME OR DIFFERENT ON OTHER PLANETS AND MOON TO THE EARTH? Different 12 of 18 ORBITAL SPEED? Speed = Distance x Time 13 of 18 ORBITAL DISTANCE TRAVELLED? 2 x pie x radius 14 of 18 what is MASS? Amount of matter, kg, stays the same wherever it is. 15 of 18 What is WEIGHT? The force that acts on the object because of gravity 16 of 18 equation for WEIGHT? Weight (N) = Mass (kg) x Gravitational Field Strength (N/kg) 17 of 18 WHY ARE PLANETS AND MOONS VISIBLE? They reflect light from the sun 18 of 18
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