Welcome to week 5! Last week you learned about the future and the past of the Sun. You also learned about some of the forces that are at work in the solar system.

This week will be a little different than the previous weeks. In this week you'll be taking a test on the material you've learned so far. There will be some review sections that summarize the key concepts in the first four weeks. Remember, you can go back and review material in any of the previous weeks as well.

You have no additional assignments due this week, so study for your test and complete any unsubmitted assignments from weeks 1 - 4. If you have all of the assignments done for weeks 1 - 4, you will be much better prepared for the Unit 1 test!

The HARD DEADLINE for the Unit 1 Test and all assignments from weeks 1 - 4 is Monday, February 22nd!