1. Aces Training Keep your Aces Answer Sheet! Worth a large Test. (100 pts) 1.Pick-up Aces “Warm-up” on back table. 2.Turn-in answer sheet before we go over it. 3.Turn-in questions. 4.Pick-up both at beginning of period on back table.

2. Strategy Review. 1.P.O.E. 2.Focus Words 3.2-pass method 4.Know your enemy 1.Know your enemy 2.2-pass method 3.Focus Words 4.P.O.E. Which ORDER should you use them?

3. #20 #21 #22 #23

4. “The Solar System in a Nutshell” Chapter 25 However did it get into this nutshell?!

5. Do Stars Move? Does the Universe have an end? Will you eventually run into a wall?... How many constellations there are?

6. Properties of Stars Color: –b/c of Temp o –Hot = B____ –Cooler = R___ –Yellow? Mass: –How much “stuff” –“M_____R” ATTE LUE ED

7. Binary Stars: What are they?! Stars that orbit each other Gravity! Helps find Mass!

8. Artist Rendition of Binary System LH54-425, located in the Large Magellanic Cloud Nasa.gov Really not that cool.

9. Distance to Stars Parallax: –Noticing shift in location throughout the year. Light-years!

10. Brightness. 1.Size 2.Temp o 3.Distance from Earth

11. Hertzsprung-Russell Diagram Variable Stars – Some change brightness Nova – Gets Brighter!

12. Gosh that sounds familiar… A Cloud of Dust & Gas in Space is a ________! NEBULA Assignment! – GR. 25.1 For Stamp!

13. Stellar Evolution 1.Birth (contraction) 2.Protostar (Temp o ↑) 3.Main-Sequence –(Hydrogen Fusion) –(90% lifetime) 4.Red-Giant (Grows, Temp o ↑↓) 5.Death. (Burn-out) –Runs out of gas. –Literally.

14. Nucleosynthesis. As stars die, they release ingredients for new elements. Dying star Uses Hydrogen Releases Helium: Smallest Element Helium sticks together Forms other elements

15. Eventually… …All stars collapse! 1.White Dwarf 2.Neutron Star 3.Black Hole All Very DENSE! most least

16. The Universe. Contains all galaxies. Everything. Lawndale HS: Universe 600 building: Milky Way Galaxy Room 605: Solar System Your Desk: Earth.

17. Spiral Galaxy Our Solar system = 2/3 way out! Milky Way Galaxy.

18. Expanding Universe. Getting B______. Hubble’s Law: –Galaxies that are farther away are moving away faster! IGGER