What do we call the old model of the Solar System that had the Earth at the cente of everything?

• geocentric
• heliocentric
• earthcentric
• terracentric

Who came up with the "heliocentric" model of the Solar System?

• Copernicus
• Ptolemy
• Newton
• Galileo

The current model of the Solar System has how many planets and dwarf planets?

• 8 planets, 5 dwarf planets
• 9 planets, no dwarf planets
• 8 planets, 8 dwarf planets
• 9 planets, 6 dwarf planets

What shape are the orbits of the objects that move around the Sun?

• elliptical
• oval
• circular
• egg shaped

What invention allowed scientists to see objects in greater detail, leading to the discovery of some of Jupiter's moons, and the idea that not everything orbited the Earth?

• telescope
• satellites
• space telescope
• binoculars

Why are some telescopes placed into orbit around the Earth?

• because the atmosphere absorbs some of the light they are trying to detect
• so that they are closer to the stars, so will get a clearer image
• they're not, there are no telescopes in orbit around the Earth
• It keeps them safe from damage from the storms they would experience on top of mountains

How do you calculate weight?

• mass x gravitational field strength
• stand on some scales
• mass ÷ graviational field strength
• gravitational field strength ÷ mass

What is the gravitational field strength of the Earth?

• 9.81 N/kg
• 98.1 N/kg
• 981 N/kg
• 100 N/kg

Which of these bodies would have the greatest graviational field strength?

• Jupiter
• Earth
• Venus
• Mars

What happens to the size of gravity as you get further away from the Earth?

• It gets weaker
• It gets stronger
• It remains constant
• It remains constant until the edge of the atmosphere, and then it gets weaker