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from the fact that virtually every galaxy is moving away from us and more distant galaxies are moving away from us at a faster rate than the closer ones, we conclude that..
the farther we look into space the further in the past we look.
what 3 major changes occured in the solar nebula as it shrank in size?
heating, spinning, and flattening
what does accretion mean in terms of planet formation?
the process by which small seeds grew into planets called accretion
define white dwarf.
the hot compact corpse of a low mass star, typically with a mass similar to the sun
what is an accretion disk?
rapidly rotating disk of material that gradually falls inward as it orbits a star-like object
what does the nebular theory state?
how our solar system formed from a cloud of interstellar gas and dust
why do jovian planets have so many large moons?
accretion within the disks of gas surrounding individual jovian planets.
what scaled object would describe the size and distance of earth on the same scale? (sun=grapefruit)
earth is a ball point pen 15 meters away
what is nuclear fusion?
the process by which lightweight atomic nuclei smash together and stick to make heavier nuclei
put addresses in order(solar system, milky way, you, earth, local supercluster, and local group
you, earth, solar system, milky way, local group, and local supercluster
how big if an area will be covered by all 9 planet orbits of the solar system? (sun=grapefruit)
over 300 football fields
how can you describe the milky way?
a spiral galaxy with a disk about 100,00 lightyears in diameter and containing between 100 billion stars and 1 trillion stars
what is equivilent to all the stars in the universe?
all the grains of sand on all of earths beaches
what would you use to determine the chemical compostion of a distant planet or star?
high spectral resolution
ptolemy was important because...?
he was the one who claim the earth to be the center ofthe universe
the ancient greeks get alot of attention for their contributions to science because...?
the geocentric model
why is the geocentric model the model of the universe?
it explains motions of the sun, moons, planets,and stars`
what is the big bang?
it states that all the matter in our observable universe all comes out in a single moment
what is a typical galaxy?
milky way and a collection of a few 100 billion to 1 trillion stars all bound by gravity
whats the difference between a planet and a star?
fusion; planets are smaller, dimmer, and orbit the stars
a pair of stars that we can determine are orbiting each other only by measuring their periodic doppler shifts is called?
what does the nebular theory predict on how our solar system was formed?
through stars collisions with each other
what is the celestial sphere?
the imaginary sphere on which objects in the sky appear to reside when observed for earth
what is the meridian?
a half curcle extending from your horizon due south, through your zenithto your horizon due north
stars are visible in the local sky on any clear night of the year, at any time of night, what are they called?
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