Astronomy: Planets, moons, stars, galaxies
Our nearest galactic neighbor. M31, a.k.a. the great galaxy in Andromeda
Our solar system in our galaxy Pale Blue Dot How big?
Don’t believe what you see on TV or in the movies! Kepler Spacecraft Discoveries
The Milky way as seen from Earth. High res image of Milky Way
Progression What’s in the “Universe”? Star Systems - A star and it’s associated planets is called a Star System . Remember- Our sun is a star. All the stars in the sky at night are suns, much like ours. Galaxies - Star Systems cluster in groups called galaxies. The Universe - All the galaxies together make the known universe. The universe is not infinite.
The Nearest star system to ours is Proxima Centauri. It is 4 Light Years away The Voyager Space craft left Earth in 1977 to photograph the outer planets. It passed the orbit of Pluto in 1990 and is now on it’s way to Proxima Centauri. It is carrying a message from Earth. The Golden Record It is traveling 17 Km per Second. (What I call “Space Normal Speed”.) Which is about 40,000 miles per hour. At that speed it will arrive at Proxima Centauri in 73,000 Years! 1 Light year equals 6,000,000,000,000 miles
How Many? From Star system -> to Universe There are about 200 billion star systems in a galaxy. And There are about 200 billion galaxies in the known universe. Where does that leave you?
How big is a billion?? If you counted 1 number per second how long would it take you to count to a billion? To count to 10 takes 10 seconds To count to 1000 takes 17 minutes A million would take 12 days A billion would take 32 years!
Let’s start small Our star system is composed of one star, eight planets, dozens of moons and countless, asteroids, comets and meteoroids. We are located on the outer edge of the Milky Way Galaxy. If we could leave our galaxy and look back, it would look like this.
The world has been known to be round for thousands of years. Why did Columbus sail the ocean blue in 1492? How it was done with Carl Sagan "Cosmos"
ISON falls apart as it goes around the sun.
Geocentric Vs. Heliocentric Early astronomers were Geocentric which means: “Earth Centered” Aristotle (350 B.C.E.) and Ptolemy (100 C.E.) were two well known Geocentric astronomers. But Geocentrism was wrong and later astronomers became Heliocentric. Which means: “Sun Centered.” Retrograde motion animation Retrograde motion animation 2
A Little History: These are the great names in astronomy. Practically everything we know today is based on the accomplishments of these people. Nicolaus Copernicus Tycho Brahe Johannes Kepler Galileo Galilei Isaac Newton 1473 – 1543 1546 – 1601 1571 – 1630 1564 – 1642 1642 - 1727 Notice how their lives overlapped, allowing them to hand off their knowledge and discoveries to the next one.
Phases of the moon The lunar phases are a result of the sunlight reflected by the moon as seen from Earth.
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