NATS 1880 Study Guide - Midterm Guide: Baryon, Vacuum Energy, Local Group

• School: York University
• Department: Natural Science
• Course: NATS 1880
• Professor: Paul Delaney

Document Summary

The size and scale of the universe: our cosmic address is: Solar system in our galaxy, milky way. The local group is in the local super- cluster. All of the matter and energy in existence. Matter that you would recognize (planets, stars, etc. Dark matter cannot be seen but does have a gravitational in uence: 28% Dark energy (vacuum energy) cannot be seen but manifests itself as a repulsive force : the universe contains: 68: the earth is 1 a(stronomical) u(nit) from the sun, 150 million kms, a light year (ly) is the distance a photon of light (beam of light) will travel in a year. The seconds in a year: 60 x 60 x 24 x 365. 25 = ~3. 156x107. The speed of light: 300, 000 km per second. Thus the distance light would travel in a year is: 60 x 60 x 24 x 365. 25 x 300, 000 or 9. 46 x 1012 km.