Warm - Up 1. List the outer planets. List the inner planets. 2. What is the difference between a meteor, meteorite, and meteoroid? 3. What is a comet? 4. What is a “shooting star”?

Stars and Galaxies 14 - 3

Satellites Satellites – anything that orbits another body Natural satellites – Moon Man made satellites – TV satellites

Stars Always out Can see better at night Sun – closest star

Constellations Constellations – groups of stars that form patterns in the sky Named after animals, objects or people Early Greeks discovered many

Starry Colors Stars come in different colors sizes temperatures masses

Temperature Color indicates temperature Red – coolest Yellow – medium Blue / white - hottest

Our Star Sun – yellow, medium sized ½ way through it’s life

A Life of a Star Start as clouds of gas and dust Gravity collects Gets so dense produces energy

Life of a Star Medium Star – used up some gasses in center Expands – Super Giant Eventually gas used up – contracts and becomes a Black Dwarf

Super Giants Uses up gases in core Eventually collapses Supernova - Outer part explodes Debris forms other stars

Neutron Star Core of the Super Giant If large enough can become a Black Hole Very dense area

Galaxies Galaxies – a group of stars, gas, and dust held together by gravity

Light Years Light year – used to measure distance between galaxies Light year – distance light travels in one year 9.5 trillion km Looking back into time!

Milky Way Galaxy Galaxy we live in Over a trillion stars Sun revolves around the Milky Way Once every 240 million years

The Universe Over 100 billion galaxies, or more? All make up the Universe What are the chances that we are alone?

Vast Reaches of Space Clip