AST201H1 Lecture 8: AST 201 LECTURE 8

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Bryan Gaensler, C. Barth Netterfield, Ilana MacDonald

Document Summary

A star with a spectrum in the middle (close to where the green light area is) appear white. That is why there is no green stars in the sky. Historically, no one was ever sure what powered the sun. It looked like the sun was made of the same things as earth and was on fire. Every atom in the sun feels gravity but because they are moving rapidly, the sun stays where it is in space. To maintain the pressure balance in the centre, the sun must be hotter there. Einstein"s formula of e = m * c^2 plays a factor into this question. It did not take long for people to turn this equation and use it for bad, such as the bombs used in. Nuclear reactions can convert matter to energy, or the opposite. The humble proton has a mass of 1. 00728 units. When you add up four protons you should get.