Talk:A-level Physics/Cosmology/Stars and Galaxies


 * 1) describe the nuclear fusion processes taking place within the Sun.&#10004;
 * 2) calculate the energy released as a result of the fusion processes taking place within the Sun.
 * 3) understand and use the magnitude scales for stars and galaxies.&#10004;
 * 4) recall and use the equation m = -2.5 lg I + constant, where m is the apparent magnitude and I is the intensity.
 * 5) understand the concept of absolute magnitude M.&#10004;
 * 6) recall and use the inverse square law to derive the relation between apparent magnitude, absolute magnitude and distance: m - M = 5 lg (r/10).
 * 7) recall and use the relationship m - M = 5 lg (r/10).&#10004;
 * 8) sketch and interpret a Hertzsprung-Russell diagram of absolute magnitude plotted against temperature in order to recognise and identify different classes of star.
 * 9) describe how clouds of gas, consisting mainly of hydrogen and helium, form into young Main Sequence stars.&#10004;
 * 10) describe the probable evolution of the Sun into a red giant and represent this evolution on a Hertzsprung-Russell diagram.
 * 11) recall that the Main Sequence stars may evolve into red giants, white dwarfs, supernovae, neutron stars or black holes.&#10004;
 * 12) recall and understand that the nuclear processes occurring in a star, the time it spends on the Main Sequence and its ultimate fate depends on its mass.&#10004;
 * 13) describe the structure of our own Galaxy and the Sun’s position in it.
 * 14) explain qualitatively how other galaxies differ from our own.
 * 15) recall and use Newton’s law of Gravitation to relate the mass of a galaxy to orbital speed within it.

Carried over from Talk:A-level_Physics/Cosmology/Models_of_the_known_universe

8. show awareness of the principal contents of the Universe, including stars, galaxies and radiation.

11. recall the distances involved between objects in the Universe, including distance to nearest stars, distance across a galaxy, size of observable Universe.

12. appreciate the range of magnitudes of the sizes and masses of objects in the Universe.

Isnt there a mistake on the page?? i parallax is 1/3600th of a degree right??