Earth’s Solar System

Astronomy

* 8 Planets Go Around The Sun

* Satellites (Moons) of Planets

* Asteroid Belt

* Comets

Sun = Star

My Very Educated Mother Just Served

Us Nachos!!!

MyMercury

VeryVenus

EducatedEarth

MotherMars

JustJupiter

ServedSaturn

UsUranus

They’re Outta This World!

NachosNeptune

Two Groups Of Planets

Two Groups Of Planets

Inner Planets – Dense, Rocky & SolidMercury – So Hot...No AtmosphereVenus – Very Bright In The SkyEarth - …Earth Science RoxMars – Fe = Red

Asteroid Belt

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 BrightnessApparent Magnitude – how bright a star appears to an observer on

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

Light Year

Distance Light Travels In 1 Year…

9.5 Trillion km9,500,000,000,000 km9.5 X 1012

km