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Astronomy Study of • Stars • Planets • Other bodies found in space What is used • Telescope • Satellites • Probes A Star is a large ball of gas. Types of stars • • • • • Blue ( Hottest) White Yellow (Our Sun) Orange Red Polaris • Also known as the North Star • Located almost right above the North Pole Life Cycle of a star • Begins as a cloud of gas • Core reaches 1 million C, energy is given off • When most of the hydrogen is used up, becomes a red giant • Depending on size, becomes a white dwarf or a supernova Constellations • Stars when connected form a picture. • Little Dipper • Orion’s Belt Circumpolar Constellations • Constellations that appear above the poles Galaxy • Huge group of stars, gases, and dust Smallest to largest • Star • Constellation • Galaxy •Universe Year • Time it takes for the EARTH to orbit (revolve) around the sun once. Black Hole • Massive star • Has so much gravity • Even light doesn’t escape it. Light Year • Distance light travel • in one year • about 6 trillion miles Planets in order from the sun • • • • • • • • Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune My Very Educated Mother Just Served Us Nachos Planets • Large objects that revolve around the sun Mercury • Closest to the sun • Largest differences between how hot and cold it gets. Venus • Longer day than year • Hottest planet Mars • Known as the Red Planet • Had liquid water on it at one time Jupiter • Largest planet • Violent atmosphere Saturn • Most moons • Rings • Could float Uranus • Tilted on its axis more than any other planet • Greenish color due to methane in the air Neptune • Farthest away from the sun • Has a great dark spot from a rotating storm