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-The entire universe was confined to a dense hot, supermass ball
-About 13.7 billion years ago, a violent explosion occurred,hurling this material in all directions
-Marks the beginning of the universe |
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Theory of how the bodies of our solar system evolved from an enormous rotating cloud called the solar nebula. Made up of hydrogen and helium
Theory of how the planets were formed |
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| Expanding universe theory |
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| developed from the observed red shits of celestial bodies that the space between galaxies is expanding, so that they appear to recede from us at velocities that increase with their distance. |
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is the turning or spinning of a body on its axis
causes day and night |
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time interval from 1 noon to the next
about 24 hours |
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time it takes for Earth to make one complete rotation with respect to a star other than the sun
23 hours, 56 minutes, 4 seconds |
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| is the motion of a body along a path around some point in space |
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Earth is closest to the sun
147 million km away
Jan 3rd |
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Earth is farthest from the sun
152 million km away
July 4th |
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| slight movement over a period of 26,000 years where Earth's axis points in a different direction |
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| What are the 2 stars that Earth's axis points? |
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| Which star is Earth's axis currently pointing? |
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oscillatory movement of the axis of a rotating body or a wobble
occurs about 18.6 year |
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the point between two objects where they balance each other.
the center of mass where two or more celestial bodies orbit each other |
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| the tilting of the Earth on its axis |
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| When the Earth is tilted toward the sun? |
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| When the Earth is tilted away from the sun? |
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