Stars. Composed of ~98% H and He Fusion in the core supports the star Full spectrum of masses. Key Properties. Apparent Brightness Luminosity Temperature / Color Mass Evolutionary State. Brightness. Absolute brightness Luminosity Power emitted by star into space Only depends on star
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where p is in arcsecs and d is in parsecs
How objects appear from here on Earth
Depends on distance
We can only see objects with m≤6
Using Binary Systems