Stars.

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Presentation transcript:

Stars

February 2017 Night Sky

Crash Course Astronomy #2

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

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

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

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

PBS Shows of Interest Nature - PBS: Spies in the Wild NOVA Wed. @ 7:00 pm Sun. @ 5:30 pm NOVA Wed. @ 8:00 pm Sun. @ 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:

Crash Course Astronomy https://www.youtube.com/watch?v=0rHUDWjR5gg&t=4s Astronomy Magazine http://www.astronomy.com/videos How the Universe Works http://www.sciencechannel.com/tv-shows/how-the-universe-works/ Deep Astronomy https://www.youtube.com/user/tdarnell Sci Show Space PBS Space Time https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g/videos NASA https://www.youtube.com/user/NASAtelevision