There are no equations in our Astronomy module – just a bundle of facts, models and theories. To make learning (and revising) easier, the knowledge that you need can be linked into seven pairs of ideas as listed below;
1. Models of the Universe: Geocentric versus Heliocentric
2. Observing the Universe: Naked Eye versus Using Telescopes
3. Birth of the Universe: Steady State versus Big Bang
4. Important Evidence: Red Shift and Cosmic Microwave Background (CMB)
5. Telescope Types: Visible Light and Other Signals
6. Telescope Locations: On Earth versus In Space
7. Star Evolution: Average Stars and Massive Stars
If you can write a paragraph for each of these seven topics, explaining what the two ideas are and how they compare with each other (either similarities/differences or advantages/disadvantages) then you probably have enough knowledge to do well in this topic.
The only other information you will need is an understanding of orbits (remember that both objects exert a force on the other object), a general description of the structure of the Universe (moons, planets, comets, stars and galaxies) as well as the units that we use for measuring astronomical distances; kilometres (km), astronomical units (AU) and light years (LY).
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