1. Deep Space Objects

2. Where are Stars Formed? Stars are born within clouds of gas and dust scattered throughout the galaxies These clouds of gas and dust are called “nebula” An average star takes about 50 million years to go from the start of the nebula to becoming an active star

3. Nebulas: Example

4. Orion Nebula Most Famous of all nebulas 1500 light-years away Several stars are forming inside this nebula

5. Butterfly Nebula FFou Found in the constellation Scorpio 3800 light-years away

6. Cat’s Eye Nebula 3300 light years away from Earth First discovered by William Herschel In 1786 Found in constellation “Draco the Dragon”

7. Hourglass Nebula Located in the constellation “Musca” the fly. Located in the Southern Hemisphere sky 8000 light-years from Earth

8. Protostar Gravity causes the gases of the cloud to collapse toward the center As the gases in the center become more dense and hot, a protostar forms

9. Protostar As the core of the protostar gets bigger, the pressure and heat gets greater. When the temperature reaches 15 million ºC, nuclear fusion begins and active star forms

10. Two Astronomers working alone came up with the same major discovery in 1911 Ejnar Hertzprung- Working in Holland Henry Rollins Russell- working in Princeton, New Jersey

11. H-R Diagram

12. Betelgeuse: An Example of a Red Supergiant Star Name: Betelguese Translation: Arabic for “armpit of the great one” Distance 642 light years Surface Temperature: 3500 K Will become a supernova

13. Where is Betelgeuse? Found in the constellation Orion, “The Great Hunter”

14. How Big Is Betelgeuse?

15. Supernovas: The Explosion of a Massive Star

16. Blue Supernova Release of the outer layers of the sun Leaves behind either: neutron star black hole

17. Neutron Star Very dense- one teaspoon full would weigh a billion pounds on Earth Very small (20 Km) Often releases bursts of energy (called pulsars)

18. Blackhole Produced by the collapse of the largest, hottest stars. Gravity is so strong that light can’t escape.