ASTA01H3 Lecture 17: key points (lecture 17, 18 and 19)
Document Summary
Lecture 17: saturn: rings go through phases, density less than water, 1/3 mass of jupiter, rotation speed squashes the saturn so that equatorial diameter is. triton surface has few craters indicating active surface. triton was probably captured by neptune www. notesolution. com. surface is young, features icy cryovolcanoes, result from ice heating up from the sun. surface is frozen nitrogen and methane when these are warmed by the sun they liquefy resulting geysers. Meteoroids: meteors are less 100m diameter, smaller meteors are fragments of comets, very old 4. 4 to 4. 6 billion years old. Spectroscopy lines: emission lines: multiple single frequencies emitted by particular atoms, black represents all frequencies not present, emission spectrum of a gas is its unque fingerprint. can be used to identify elements: can increase the width of lines by thermal doppler broadening, solar spectrum, suns spectrum is not continuous. luminous solid, liquid or dense gas produces continuous spectrum.
