Geometry of the Universe - Geometry of the Universe For...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Geometry of the Universe For distant galaxies you need something more luminous than a star to derive its distance o star does not stand out enough, like it usually does o can use novae or galaxies galaxies are not a good way of getting distances because they vary for the most part o type 1A supernovae are the best benchmark for measuring large distances If we measure the peak brightness of type 1A’s in closer galaxies we can calibrate how luminous they really are o can then find them in more distant galaxies Geometry of the universe is intimately related to its fate Assumptions: o on the largest scales, the universe is uniform – looks about the same in one patch as it does in others o Same average density over large areas o Galaxies are oriented in a random way – isotropic o cosmological principle – both homogenous and isotropic o No large scale repulsive effect in the universe Einstein thought that there had to be a repulsive force to balance out the attractive force of gravity
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Geometry of the Universe - Geometry of the Universe For...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online