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Astronomy First Midterm Study Guide - Astronomy First...

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Astronomy First Midterm Study GuideChapter OneScientific Notation:the system of recording very large or very small numbers byusing powers of 10Solar System:the sun and the nonluminous objects that orbit it, including theplanets, comets, and asteroidsPlanet:a small, non-luminous body that shines by reflected light from a star it orbitsaroundStar:a globe of gas, held together by its own gravity, that generates energy bynuclear fusion.Astronomical Unit (AU):defined to be the average distance between the Earth andSun. It is a convenient distance unit to use when discussing distances within theSolar System (such as between planets).Light-Year (ly):the distance light travels in one year in a vacuum. (Since all forms ofelectromagnetic radiation travel at the same speed in a vacuum, it is also thedistance that radio, infrared, ultraviolet, etc. travels in one year.) We use it to expressinterstellar distances.Galaxy:an enormous collection of stars, gas, and dust, held together by its own self-gravitation.Milky Way:The hazy band of light that circles the sky, produced by the combinedlight of billions of stars in our Milky Way Galaxy.Milky Way Galaxy:The spiral galaxy containing the sun; visible at night as the MilkyWayWhat is the difference between our solar system, our galaxy, and the universe?
What does the size of the star image in a photograph tell you?
How aredistancesto things in the universe connected to our understanding ofthehistoryof the universe?
Chapter TwoConstellation:an area of the celestial sphere denoting a direction in space awayfrom the Solar System. Constellations are marked by fanciful “connect the dots”imaginary pictures, (such as the Big Bear or the hunger Orion), but those pictureshave no real, physical significance.

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Term
Spring
Professor
sherwoodharrington
Tags
Astronomy, Comets, Solar System, Tycho Brahe, Astronomy Solar Midterm, Planet

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