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Section 1 The Milky Way Galaxy K What I Know W What I Want to Find Out L What I Learned Essential Questions What is the size and shape of our galaxy What are the different kinds of variable stars. Jaymie Matthews Professional Astronomer 2 Paul Hickson Professional Astronomer 3 Jayanne English Professional Astronomer 4 Sun Kwok Professional Astronomer 5 David Levy Amateur Astronomer 6 Terence Dickinson Amateur Astronomer 7 Tyler Foster Thermal Spectra. Emission . and Absorption Spectra. Recap. Campus observatory. Project . due 11/22. Continuous . emission and colors of . objects. Why do dense objects produce continuous emission?. Temperature as a measure of average speed of atoms in a material. Soprano I Hence  stars,  you  daz- zle but the sight,   you teach to Soprano II Hence  stars, \r \r \r Alto Hence  stars, hence   stars too  dim of light,  you  daz-  zle  b The stars and other objects in space are very far from Earth. Only a few solar system objects are close enough to be explored with probes. . Astronomers rely on electromagnetic waves to gain information about the universe.. Science 9. Using scientific notation. Distances in space are very large. We use scientific notation to represent very large and very small numbers. The first digit is between 1 and 9. This is called the base. What is a Constellation?. A specific group of stars.. Ancient people of many cultures . connected. groups of stars to form patterns, like huge dot-to-dot puzzles.. These . patterns. are known as constellations. . . . 5,880,000,000,000 . miles or . 5.88 trillion miles.. The Milky Way. The Greek philosopher Democritus (450–370 BC) proposed that the bright band on the night sky known as the Milky Way might consist of distant stars. Aristotle (384–322 BC), however, believed the Milky Way to be caused by "the ignition of the fiery exhalation of some stars which were large, numerous and close together" and that the "ignition takes place in the upper part of the atmosphere, in the region of the world which is continuous with the heavenly motions.“ The . OUR PLACE IN SPACE. Earth is not special. We do not have any unique place in the Universe. We live on an ordinary rocky planet called Earth, one of nine known planets orbiting an average star called Sun. We are near the edge of a huge collection of stars called the Milky Way Galaxy, which is one galaxy among countless billions of other galaxies spread throughout the observable universe.. RADIO WAVES. HOW DO RADIO WAVES HELP ASTRONOMERS. Astronomers learn about a stars composition, structure and motion . MICROWAVES. HOW DO ASTRONOMERS USE MICROWAVES. ASTRONOMERS PICK UP THE COSMIC MICROWAVE BACKGROUND THAT WAS LEFT OVER FROM THE BIG BANG. constellations. a. Ancient cultures used . mythology. or everyday items to name constellations. 2. Modern astronomy studies . 88 . constellations. 3. Some constellations are not . visible. all year because Earth revolves around the Sun. Stars 1. Patterns of stars – constellations a. Ancient cultures used mythology or everyday items to name constellations 2. Modern astronomy studies 88 constellations 3. Some constellations are not What is a Constellation?. A specific group of stars.. Ancient people of many cultures . connected. groups of stars to form patterns, like huge dot-to-dot puzzles.. These . patterns. are known as constellations. . How far away are the stars?. FAR away!. Nearest star system: Alpha Centauri. Distance: 4.23 light-years. But how do we know that?!?. Recall: . 1 light-year = 9.5 trillion km. BUT: only works out to about 300 light-years. 22.1 Our View from Earth . Stars seem to move but Earth is actually moving west to east. So objects in the sky seem to rise in the east & set in the west . North star, Polaris is above North Pole and stars around it seem to form a circle-always present in Northern hemisphere.