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What is astronomy?
The study of the universe
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How was the Universe created?
the big bang theory
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What is the Big Bang theory?
A massive explosion occurred between 10-20 billion years ago.
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Ever since the big bang theory the universe has been...
expanding
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All galaxies are part of the...
universe
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what is a galaxy?
a collection of millions or billions of stars
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What are galaxies classified by?
shape
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what are the different types of galaxies?
spiral, elliptical, irregular
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what is the main type of galaxy?
spiral
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what type of galaxy is our milky way?
spiral
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where is the sun located in our galaxy ?
on one of the spiral arms far from the galactic center
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our sun is an ________ sized star and a _______ aged star
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how old is our sun estimated to be?
4.5 billion years old
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the solar system includes...
our sun, eight planets, comets, asteroids, meteoroids
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What are the order of the planets?
mercury, venus, earth, mars, jupiter, saturn, uranus, neptune, (pluto)
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what is in between mars and jupiter?
an asteroid belt
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how did our star (sun) form?
From a nebular cloud (composed of gas and dust)
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what was our sun before it was a star?
a prostar
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what are terrestrial planets?
the inner planets that are small and rocky
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what are gas giants?
the outer planets that are large and gaseous
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what are comets made of?
chunks of ice and dust
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what kind of orbit do comets revolve around the sun?
an elliptical orbit
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what are asteroids?
small and rocky objects that revolve around the sun
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what are meteoroids made of?
chunk of rock or dust in space
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what do meteoroids come from?
part of a comet or an asteroid
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what was the Geocentric theory?
that the earth was in the center of our solar system
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what is the Heliocentric theory?
that the sun is in the center of our solar system
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what keeps planets moving?
inertia
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what keeps planets in their orbit around the sun?
gravity
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as earth gets closer to the sun it moves...
faster
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as earth moves further away form the sun it moves...
slower
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what are stars born from?
planetary nebula
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electromagnetic energy is radiated by...
stars
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stars vary in their...
size, mass, density, temperature and color
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what is the H-R diagram used for?
to classify stars
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what is a ring (for a planet)?
thin disk of small particles of rock and ice surrounding a planet
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what units of measurement would we use to measure the distances of our sun to the planets in our solar system?
astronomical units
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which are the two largest planets?
jupiter and saturn
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which planet is closest size to earth?
venus
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what is a star life cycle determined by?
the stars mass
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The medium sized star in our solar system is the...
sun
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define glow
to shine brightly
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a star that doesn't give off light is a...
black dwarf
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a glowing ball of gas is a...
star
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what is the core of the star?
the middle or center of the star
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what is a red giant?
a large star that glows red
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define expand
to grow larger
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What is the life cycle of a medium star?
nebula, medium star, red giant, planetary nebula,white dwarf, black dwarf
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what is the life cycle of a huge star?
nebula, huge star, red super giant, supernova, neutron star
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what is the life cycle of a giant star?
nebula, giant star, red super giant, supernova, black hole
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which color star has the highest (hottest) surface temperature?
blue stars
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