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# Astronomy 1010 Ch 1 Astr 1010

GSU
GPA 3.2

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These are notes that are covered in the the first chapter of our book.
COURSE
Astronomy
PROF.
TYPE
Class Notes
PAGES
4
WORDS
CONCEPTS
Astro 1010, Astronomy 1010, astronomy, GSU
KARMA
25 ?

## Popular in Science

This 4 page Class Notes was uploaded by Alikhan Ladhani on Wednesday January 20, 2016. The Class Notes belongs to Astr 1010 at Georgia State University taught by in Spring 2016. Since its upload, it has received 84 views. For similar materials see Astronomy in Science at Georgia State University.

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Date Created: 01/20/16
Astronomy class notes 1/20/16 10:01 AM Star • A large glowing ball of gas that geraerates heat and light through nuclear fusion Planet • A moderately large object that orbits a star it shines by reflected light planets may be rocky icy or gaseous in composition • Reflects sun light Galaxy • A great island of stars in space, held together by gravity and orbiting a common center Universe • The sum of all matter and energy everything within and between all galaxies The scale of the universe • units o distance: meter (of kilometer= 1000m) o mass: gram (or kilogram= 1000g) § how much matter in an object o time: second (1 day= 24 hr x 60 min x 60 s) • powers of 10 o need to deal with big numbers: EARTH- SUN distance= 150,000,000 km= 1.5x10^8 kilometer o also small numbers: mass of hydrogen atom = 0.0000000000000000000000017 gram = 1.7 x 10^-24 gram • Distance in astronomy o Astronomical unit- the average distance between the earth and sun (1.5 x 10^8km) o Parsec- the typical distance between stars as defined by the angular wobble caused by earhts orbit (3.1 x10^13 km) o Light-year- the distance between light can travel in one year (9.5 x 10^12 km) • how big is the universe? o the milky way is one of about 100 billion galaxies that we can see o 10^11 stars/galaxy x 10^11 galaxies = 10^22 stars § as many stars as the grains of san on all of earths beaches • history of universe: 14 billion years Destination Light travel time moon 1 second Sun 8 minutes Sirius (nearby star) 8 yr Andromeda galaxy 2.5 million years § **when we see the sun we are seeing it how it was 8 minutes ago Our cosmic address • Earth is a planet in our solar system o Consist of the sun, planet and their moons and smaller object like rocky asteroids and icy comets • Our solar system belongs to the milky way galaxy o Galaxy is a great island of stars in space containing between a few hundred million and a trillion or more stars o Milky way one of the 2 largest among about 40 galaxies in the local group • Groups of galaxies with more than a few dozen members are often called galaxy clusters • Regions where galaxies and galaxy clusters are most tightly packed are called super clusters which are essentially clusters of galaxy clusters 1/20/16 10:01 AM 1/20/16 10:01 AM

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