Read my Week 8 instructor notes for an introduction to this week's topic.

1.

• Go to the following page to find information concerning what we know about planets outside our solar system, aka extrasolar planets.   This information may be particularly useful for the week 8 quiz.


• Go to the following page to see evidence supporting the theory of planet formation:  extrasolar planet formation evidence


• Click here for more information about asteroids & comets.


• For a good summary of the Tunguska explosion event in Siberia in 1908, go to the following links:
  http://en.wikipedia.org/wiki/Tunguska_event
  http://antwrp.gsfc.nasa.gov/apod/ap071114.html


• For a summary of Earth craters, with images, go to the following link:
  http://www.unb.ca/passc/ImpactDatabase/


• Go to the following link to read about the news of a mass extinction that occurred about 250 million years ago (even bigger than the Chicxulub event):
  http://skyandtelescope.com/news/article_1257_1.asp


• Click here for a good description of the major implications of finding Sedna, a planetoid orbiting far beyond Neptune's orbit - also beyond the Kuiper belt.