What was the name given to the model of our solar system with the sun in the middle?, Fusio-centric, Geo-centric, Lumo-centric, Helio-centric, How did planets revolve around Earth in the Geo-centric model?, On elliptical orbits, The prime mover rotated the celestial spheres, Gravity pulled them round, The Sun's gravity, What is the name given to the phenomenon where planets appear to change direction across the night sky? , Reversal Orbits, Elliptical Orbits, Retrograde Motion, Gyrograde motion, What did Ptolemy introduce to explain retrograde motion?, Epicycles, Elliptical Orbits, Earth's Tilt, Gravity, What is the gravitational field strength on Earth?, 10N/kg, 9.8J, 10m/s, 1.8N/kg, Why do I weigh less on the moon?, I have less mass on the moon, The Earth's gravity lifts me away from the moon, The moon has a weaker gravitational field strength, The moon is smaller, Jupiter is roughly 300 times heavier than the sun but its field strength is only 2.5 times stronger. Why?, Jupiter is much less dense, Earth is much further away, The surface is gas, The Sun is much closer to Earth, Why does Earth's atmosphere distort ground based images?, The air is turbulent, The light is reflected, Chromatic Aberration, It is opaque to X-rays, What happens to light which travels through the turbulent atmosphere?, Light refracts due to changes in medium, Light distorts due to changes in density, Light distorts due to changes in medium, Light refracts due to changes in density, What other advantage do space telescopes have over ground based equivalents?, Cheaper, Easier to maintain, X-ray observations, Bigger.

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