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40 Cards in this Set

  • Front
  • Back
Gravity holds together a large collection of stars, gas, and dust
galaxy
Earth's Galaxy
Milky Way
What type of galaxy is the milky way
spiral galaxy
most common galaxy
elliptical
large 3d ecclipses
elliptcal
smaller, less common galaxies w/ various difference shapes
irregular
how many stars does the milky way contain
1 trillion
how many light years are there in the milky way
100000
sun orbits galaxy's core every
225 million years
universe has always existed just as now
steady state theory
universe expands and contracts overtime repeatedly
oscillating model
the universe began 13.7 billion years a go w/ a huge explosion that caused expansion everywhere at the same time
big bang
when wil the universe stop expanding and start contracting
unknown
patterns of stars
constellations
constellations are named by
ancient cultures uses myths or everyday items
modern astronomy studies how many constellations
88
why aren't some constellations visible all year
orbit
what constellations are visible all year
circumpolar
measure amount of light the star actually gives off
absolute magnitude
measure of the amount of a star's light recieved on earth
apparent
shift in position when viewed from two different angles
parallax
the distance light travels
light years
hotest stars
blue to white
coolest
red to orange
yellow
medium
the sun is what color
yellow
hr diagrams measure
brightness and temperature
who graphed based on temp and absolute magnitude
henry russell and ejanar hertzsprung
hot, blue, bright stars in hr
upper left
cool, red, dim, stars
lower right
average yellow stars in hr
middle
only how much percent is not in the main sequence
10%
fusion of hydrogen in stars cause
the releasing of huge amounts of energy
as particles move closer in a nebula temp
kincrease
at how much kelvin does fusion begin and enery from a new star begins to radiate
10 mill
balance is lost when hydrogen fuel is
used up
contracting and heating causes outerlayers to
expand and cool creating a giant star
what forms from a giant star
white dwarf
last part of a star's life
blackhole
a star can be recycled to become part of a
nebula