1. Today’s Agenda… Get clickers!  Solar System Quiz
Notes on Objects in Space
Moon quiz retake tomorrow
Homework: Study Guide (Due on Thursday)
Test/Study Packs on Friday

2. Objects in Space
Study Pack #11
Page

3. Today’s Goals…
I can describe objects in our solar system.

4. Comets Made up of rock and ice Travels around the sun
May come from the Oort Cloud (beyond Pluto)
The tail is created when:
Heat from the sun turns ice into gas
Solar winds blow the gases and dust away form the comet

5. Comets
Haley’s Comet
Hale Bopp

6. Meteorites Any fragments from space that land on Earth
Page 455 Figure 18
Important clues from space
Made of metal and rock
Hundreds fall to Earth each year!
When is the next shower?

7. Stars and Constellations
Constellations are groups of stars that form patterns
Ursa major – “big dipper”
Ursa minor – “little dipper”
Page 456 Figure 19
Named after animals, objects, people
Different groups of people may have different names

8. Starry Colors The color of a star can tell the temperature
Red – coolest
Yellow – medium
Blue-white – hottest
Stars are also different sizes
The sun is a medium sized yellow star

9. Betelgeuse

10. Apparent Magnitude Classifies how bright a star appears from Earth
The smaller the number, the brighter the star
Some stars may actually be brighter than the sun, but the sun is closer to Earth so it appears brighter

11. The Lives of Stars Clouds of gas and dust move closer together
Temperatures begin to rise
Atoms come together and change from matter to energy
This process is called fusion

12. The Lives of Stars Stars continue to change after they form
Giant stars – large, cool, red
White dwarf star – hot, small star
Black dwarf – cool, stops shining
The more massive a star is the shorter their life cycles
Small stars shine longer

13. The Lives of Stars Stars can also be supergiants
When supergiants explode they become supernovas
Page 459 Figure 22
The core of the supergiant collapses to form a black hole
Black holes have so much gravity, not even light can escape!

14. What did you learn? Comets are made up of ice and dust.
Meteorites are any objects that fall to Earth.
The sun is the largest kind of star.
All stars become supernovas.