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Two Groups Of Planets
Inner Planets – Dense, Rocky & SolidMercury – So Hot...No AtmosphereVenus – Very Bright In The SkyEarth - …Earth Science RoxMars – Fe = Red
Outer Planets – Larger, Gas, Less DenseJupiter– Biggest PlanetSaturn– Rings, < Dense Than WaterUranus- Rings Discovered 1977, -370 FNeptune – Discovered in 1930
Two Groups Of Planets
Planetoids...Pluto – Small, Fits Inside USASedna – Newly DiscoveredXena – Newly DiscoveredUB313 – Newly DiscoveredMany, Many Others...
Star BrightnessLuminosity – true brightness of a …depends on size, temp & distance
Candle vs Light Bulb vs Flashlight
Distance!!!
Star BrightnessAbsolute Brightness – Luminosity of a if they were seen @ the same distance…apparent magnitude if @ 32.6 light years from sun