Date: Feb 10, 2014Page: Table of Contents p 18

W.O.D: Last 5 pages Warm-ups: Front Cover

W.O.D. Density -the degree of compactness of a substance; the mass of an object divided by its volume (D= m/v)

Question: Which would be more dense: a ball of styrofoam, or a ball of clay?

Glossary

Today’s Plan

• Warm-up• Finish Extreme Stars• Solar system formation notes• Reflection

Astronomy Table of Contents (p. 18)Title Page Number:Sun Notes/Nuclear Fusion W.S. p. 19Periodic Table/Electromagnetic Spectrum p. 20

What is the sun made of? (draw)

Solar System Formation Notes

1. Why does the center of a collapisng nebula form a star?

2. How do planets form?3. Which planets are most

dense?4. Which planets are least

dense?5. What does E = MC2

mean?

Try to answer these questions on your own. We will review the answers as a class. Write the answers to 3 and 4 in order from the sun.

Why does the center of a collapisng nebula form a star?High temperatures cause pressure to become so intense that the crowded atoms fuse (nuclear fusion) and give of large amounts of energy.

How do planets form?

Particles swirling in a cloud of dust and gas stick together as they rotate around the forming sun.

Which planets are most dense?The rocky (terrestrial) planets are the most dense and closest to the sun:MercuryVenusEarth Mars

4. Which planets are least dense?

The gas giants are furthest from the sun, and have the lowest density.JupiterSaturn Uranus Neptune

5. What does E = MC2 mean?

Energy = Mass X Speed of Light squared.

C, the speed of light, is a very large number: 299 792 458 m / s (700 million miles an hour)

Even if M is very small, huge amounts of energy can be produced.

Reflection:Draw a hydrogen atom.