Unformatted text preview: Einstein’s law of gravity: the mass of the Sun causes spacetime to curve, so freely moving objects (eg. planets) follow the straightest possible paths. Energy Kinetic E: motion of bodies Potential E: energy stored in a body and can be used Radiation: electromagnetic radiation (waves/photons) or subatomic particles Sun contains same elements as the elements on Earth (helium present in Sun) Other stars & galaxies also have same spectral lines. Conclusion: physics is same. Universe Look at slides Andromeda galaxy-like ours Three different types of galaxies: elliptical (no gas, not forming stars), spirals (a lot of gas, stars forming), irregulars(some gas, still forming stars). Lecture 3...
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- Spring '11
- General Relativity, bodies… small corrections