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30 Cards in this Set
- Front
- Back
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the edge of the solar system is the ____________ |
Oort cloud |
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we live in the _________ galaxy |
Milky Way |
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the biggest thing we see and know is the __________ |
universe |
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revolution |
Earth's yearlong orbit around the sun |
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rotation |
the spinning of Earth on its axis |
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what are seasons caused by? |
the tilt of Earth's axis |
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where is the sun during an equinox? |
directly above the equator |
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when are the spring and fall equinoxes? |
March 20-21 September 22-23 |
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where is the sun during solstices? |
the farthest away from the equator |
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when are summer and winter solstices? |
June 21-22 December 21-22 |
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waning |
visible side of the moon gets smaller |
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waxing |
visible side of the moon gets bigger |
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what do we call the side of the moon we never see? |
dark side |
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what is the Big Bang? |
the universe used to be smaller than an atom and it expanded in less than a second. When it cooled down, particles grouped together to form atoms and matter |
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how long ago did the Big Bang happen? |
13.8 billion years ago |
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who was Aristotle? |
he saw a circular shadow on the moon which proved that the Earth was round, not flat thought planets orbit Earth in a perfect corcle |
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what does Earth's magnetic field do? |
protects us from radiaton |
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what did humans think about space in 200-300 bc? |
they thought Earth was the center of the universe |
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who was Aristarchus? |
first to claim sun at the center of the universe (heliocentric model) |
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who was Claudius Ptolemy? |
wrote the Almagest with Earth at the center |
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what did nicolaus Copernicus do in the 1500s? |
studied and out the sun at the center again |
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what happened in the 1600s? |
they had enough technology to research and map our solar sustem |
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what did Kepler and Brahe do? |
said the sun was at center with planets elliptically orbiting around it |
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what is the current model of the solar system like? |
all orbits are elliptical most are very close to circular Mercury has most eccentric orbits are tilted-not flat |
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what are the stages of a star's lifespan? |
born, mature, grow old, die |
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explain how a star is born |
born out of nebula when they get close, it get really hot and nuclear fusion begins |
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explain how a star matures |
as more fusion happens, stars get bigger and hotter and the star becomes a giant |
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what are the two ways a star can die? |
uses up its helium and contracts, dense core is left behind, turns into a white dwarf
may explode in a supernova could cause black hole if the leftover core is 3x bigger than the sun |
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what is the edge of a black hole called? |
event horizon |
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what is the closest star to earth? (besides the sun) |
Proxima Centauri |
