Ch27 - Assignment: Chapter 27 Class: Astronomy I Date:...

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

View Full Document Right Arrow Icon
Assignment: Chapter 27 Class: Astronomy I Date: November 26 th , 2007 Review Questions 1. The horizon problem, or the isotropy problem, questions how it is possible for unrelated parts of the universe to have almost exactly the same temperature. The flatness problem questions what could have happened during the first few moments of the universe after the Big Bang to ensure equal average mass density and critical density. Both of these problems can be explained by the inflation, the extremely rapid expansion of the universe after its Big Bang. 2. The inflationary epoch explains not only why the cosmic microwave background is so uniform, but also how stars, galaxies, and human can exist. 3. Just like the expansion of modern universe, the distances between particles increased enormously, but this was entirely the result of a sudden vigorous expansion of space. 4. The inflation did not deal with motion of objects through space; it was the expansion of space itself. Therefore, it did not violate Einstein’s dictum. 5. The strong force exchanges gluons, in which it binds protons and neutrons together to form nuclei. Electromagnetic force exchanges photons, in which it attracts electrons and nuclei to form atoms. Weak force behaves as short-range force to create
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.

This note was uploaded on 08/25/2008 for the course ASTRON 1 taught by Professor Jsepikas during the Winter '07 term at Pasadena City College.

Page1 / 2

Ch27 - Assignment: Chapter 27 Class: Astronomy I Date:...

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