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Astronomy 2.1 The Solar System

astronomy-2-1-the-solar-system

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What are the Superior Planets?

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Where do the Inferior planets appear in the sky?

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At what time in their orbit is it best for us to see Mercury and Venus?

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What is the GEE and GWE?

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At GEE, when will the inferior planet be visible?

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At GWE when would the inferior planet be visible?

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What is an inferior conjunction?

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What is a superior conjunction?

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When are the superior planets most favourably placed for observation - why?

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Which directions do planets seem to move in the night sky?

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Explain Retrograde Motion

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Which of the planets are Rocky/Terrestrial?

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Which are Gas Giants?

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What is the definition of a planet? A planet is a body that:

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Match the 6 types of body in our Solar System.

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Asteroids (minor planets)
Comets
Centaurs
Moons/satellites
Dwarf Planets
TNOs (Trans Neptunian Object)

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160 known - a celestial body orbiting the earth or another planet.
Half comet / Half Asteroid. Orbit between Jupiter & Neptune e.g. Chiron Hidalgo Absolus. Cross orbit of one Giant planet
Pluto, Ceres, Eris - A celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
Icy snowball consisting of Dust, Rock, Ice
> 10m but most < few hundred kms. Mainly in Asteroid belt. Vesta (brightest & biggest) - Pallas (2nd)
Objects orbiting beyond Neptune - any minor planet in the Solar System that orbits the Sun at a greater average distance (semi-major axis) than Neptune, 30 astronomical units (AU)

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