SOLAR SYSTEM

SOLAR SYSTEM - SOLAR SYSTEM ~SOLAR SYSTEM *sun and...

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SOLAR SYSTEM ~SOLAR SYSTEM * sun and everything held to solar system by sun’s gravity (asteroids, dust, gas) ~STARS double stars- two stars going around each other third stars- two stars going around each other, one going around pair our galaxy has over one billion stars ~GALAXY *spiral *elliptical *irregular * super group - groups of galaxies are grouped ~SUN largest, most massive object in the solar system produces energy radiating through solar system and space star closest star to us so appears really bright when sun is on horizon, blocks stars sun isn’t getting cooler o producing energy in itself to keep radiated in center of sun, hydrogen slams and bonds together, converts to helium and makes a lot of energy ~like a lot of hydrogen bombs going off big ball of gas that sits on core that produces gas ~EARTH * weight of earth makes up less than ¼ of 1% of weight of solar system * moon goes around once a month ~MERCURY *goes around sun quickly 4/10 *no moon ~VENUS * 7/10ths of way from sun to earth *no moon ~MARS *two moons * 1 ½ times earth’s distance from sun
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~JUPITER biggest planet many moons ~SATURN has many moons big ring system ~URANUS *discovered first *many satellites ~NEPTUNE *many satellites *Greeks divided universe into two parts *Earth not considered a planet * Sky *Sun, moon, planets *stars- had a fixed point and were called wandering plaents *7 of these *based 7 days of the week on this *Planet *big enough that its own gravity pulls it into a round shape *orbits around sun has been swept clean objects in orbit area *Pluto no longer a planet; considered dwarf planet * Classical planets are the planets from Mercury Neptune *Rocky planets- Mercury, Venus, Earth Mars *Gas Giants- Jupiter, Saturn, Uranus, Neptune *Pluto= ball of ice *Things further from Neptune that are round are called dwarf planets *Distance *how far things are away from sun *meter based on Earth’s circumference *made by French *didn’t work because Earth is slightly egg shaped * one astronomical unit - distance from earth to sun; roughly 93,000,000 miles *avg. distance from center of earth to center of sun *stars hard to get distances
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* c=speed of light in vacuum * travels at different speed, though, depending on medium of travel *travels fastest in a vacuum (like space) at 186,000 miles per second *takes 8 minutes for light from sun to hit us * light year - distance light travels in years *nearest star besides the sun is 4 ½ light years away *Andromeda Galaxy is 2 million light years away *Star Hopping - when one constellation points to another *Universe created 13.7 billion years ago *TIME * defines as that which is measure by clocks (anything that has a pattern) *earth’s rotation *Earth rotates fully on axis once a day *Earth goes around sun once a year *Moon goes around Earth once every 27.3 days (sidereal) *Moon goes from one shape, through the cycle, and back to that same shape again in 28 ½ days
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This note was uploaded on 04/08/2008 for the course ASTR 121 taught by Professor Tolbert during the Fall '08 term at UVA.

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SOLAR SYSTEM - SOLAR SYSTEM ~SOLAR SYSTEM *sun and...

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