1. Stars

2. February 2017 Night Sky

3. Crash Course Astronomy #2

4. Stars Ball of plasma held together by its own gravity
Energy due to Nuclear reactions which combine Hydrogen  Helium
Energy released as electromagnetic radiation

5. Distance Measured in light-years
The distance a ray of light would travel in 1 year
6 x1012 miles (6 trillion miles)
186,000 miles per second

6. Magnitude (brightness)
A measure of brightness of celestial objects
The smaller the values the brighter the objects

7. Apparent vs. Absolute Apparent magnitude
How bright a star appears to be from Earth
Absolute magnitude (luminosity)
How bright a star actually is

8. PBS Shows of Interest Nature - PBS: Spies in the Wild NOVA
7:00 pm
5:30 pm
NOVA
8:00 pm
4:30 pm
Over the air:
18.1
AT&T U-verse:
18 & 1018
Grande:
9 & 309
Time Warner:
9 & 1221
Dish: 18
DirecTV:
Google:

9. Crash Course Astronomy
Astronomy Magazine
How the Universe Works
Deep Astronomy
Sci Show Space
PBS Space Time
NASA