Talk:A-level Physics/Cosmology/Models of the known universe


 * 1) describe the models of the Universe as proposed by Copernicus and Kepler. &#10004;
 * 2) describe the progress in the understanding of the Universe as a result of the work of Copernicus, Kepler and Galileo. &#10004;
 * 3) use Newton’s law of Gravitation to derive an expression for the radius of the circular orbit of a planet around the Sun in terms of the period of the orbit. &#10004;
 * 4) recall and use Kepler’s laws as applied to circular orbits. &#10004;
 * 5) recall how the existence of Neptune was predicted from the orbit of Uranus. &#10004;
 * 6) appreciate the significance of Kepler’s third law as evidence of Newton’s law of Gravitation. &#10004;
 * 7) describe the contents of the Solar System in terms of the Sun, planets, planetary satellites and comets. Details of individual planets are not required.&#10004;
 * 8) show awareness of the principal contents of the Universe, including stars, galaxies and radiation. Probably better to cover this in Stars & Galaxies
 * 9) define distances measured in astronomical units (AU), parsecs (pc) and light-years.&#10004;
 * 10) recall the approximate magnitudes, in metres, of the AU, pc and light-year.&#10004;
 * 11) recall the distances involved between objects in the Universe, including distance to nearest stars, distance across a galaxy, size of observable Universe. Probably better to cover this in Stars & Galaxies
 * 12) appreciate the range of magnitudes of the sizes and masses of objects in the Universe. Probably better to cover this in Stars & Galaxies