WARM UP • Did you look at the stars? • Who/what is Andromeda? • What do you see in this picture? THE CONSTELLATIONS AND GREEK MYTHOLOGY DAY 2 WHAT IS ASTRONOMY? • It is the branch of science that deals with the celestial objects, space and the physical universe as a whole • What does that even mean?! • It means that the Study of Stars, Planets and Space 2 TYPES OF ASTRONOMERS • Observational • Theoretical OK… SO HOW DO THOSE GREEK PEOPLE COME INTO PLAY? THEY LOOKED AT THE SKY TOO HISTORY OF THE GREEKS & WHY THEY LOOKED AT THE SKY • It was practical. SO THE GODS DID WHAT? • Became an explaination EVENTUALLY • The Greeks moved away from divine power ANDROMEDA WARM UP • How old do you think the universe is? WARM UP 8/28 • Do you think Aliens exist? • What about multiple dimensions? • If money wasn’t an issue….. would you travel into space? • What do you think NASA does? LET’S GET STARTED 9/4 • What is the Harvest Moon? • Somewhere, something incredible is waiting to be known. • - Carl Sagan THE BIG BANG • What do we know about it? • But what caused it? EVEN BIGGER PROBLEM • We speculate that we’re missing between 12/13 billion years of time, but • Since the Big Bang STELLAR DISTANCES • The light-year • What does it equal? • 5.878 x 10^12 miles per year • 5,880,000,000,000 • 186,000 miles per second • 671 million miles per hour LENGTHS • 186,000 miles per second • 671 million miles per hour CONVERSION • Miles to Kilometers • 300,000 km/s • 1,080,000 km/h HANDS ON • Measuring the distance between the Sun and the planets. • We will be adding in Ceres. REMINDER HARVEST MOON TONIGHT!!!!! OUR PLACE IN THE UNIVERSE COSMIC ADDRESS • Earth -> planet in the solar system • Has the Sun & objects that revolve around it • Sun, star, and all the other stars that we see -> Milky Way Galaxy • Galaxy -> like an island • Group of galaxies -> Local Group • Local Groups w/ more than 12 -> Galaxy Cluster • Tightly packed Galaxies & Galaxy Clusters -> Super Cluster • Together everything = Universe BIG BANG RECAP • Occurred about 14 billion years ago • Things were hot, then they cooled • Expansion STELLAR LIVES AND GALACTIC RECYCLING • How did planets form? • Nuclear fusion GALACTIC RECYCLING • Star death- Supernovae ELEMENTS • In the beginning there were only 2. • Conversion THE PAST…. AGAIN • When we look at the light from other stars and galaxies that aren’t our own, we’re looking into the past. • Light years • The distance light travels in one year. LIGHT FROM ORION • The Hunter • 1500 light years from Earth WHAT WE CAN SEE IN THE UNIVERSE • Limited by the Observable Universe • Remember the Past • The Universe is 14 Billion Years old (approximately) • The light from the farthest stars we can see, sends us light from 12 billion years ago.