Black body is when a star heats up until it reaches a

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Black Body is when a star heats up until it reaches a temperature at which it emits radiation at exactly the same rate as it receives it, and then remains in equilibrium at that temperature. The proper motion of a star is its angular change in position over time as seen from the center of mass of the solar system. Sirius is the brightest star after the sun. Sun: 4.5 Billion years old, half way through its main sequence. Another 4.5 billion years to become a red giant or White Dwarf. The closest star is Proxima Centauri and is ~ 4.2 light years away. Sun's core - The conversion of hydrogen to helium through Nuclear fusion . Plage is a name for a bright region appearing in the sun's chromosphere. Sun spots (Dark Spots) are areas of lower temperature formed by magnetic activity. Solar Flares An explosion within the atmosphere of the sun. 5
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ASTRONOMY DSST 05Mar2012 Spicules A thin jet shooting out from the sun roughly 500k in diameter. Question: where is the sun located on the Galactic Cross? There is a diagram on the test. Earth’s Moon Phases/Tides: There was a pretty basic diagram on the test. Very similar to the above. Just take out the pics of the moon phases and replace with letters. 4 questions related to the same diagram scattered throughout the test. At what position is spring tide, neap tide, full moon and solar eclipse. When the moon is directly overhead, it causes a high tide both at your location and on the opposite side of the world. The high tide on the other side of the world is due to the moon's gravity pulling the Earth away from the distant water. Tidal Forces - The areas of the Earth facing the moon have a higher gravitational pull than those away from the moon. This pull causes the Earth to slightly distort, rising up and down and tilting as a fluid surface, causing the sea level changes. Spring Tides - When the sun and moon are lined up (at a full moon/new moon), The spring tides are the highest tides that the Earth experiences. Neap Tides - When the moon is at its first or last quarter, the tides produced by the sun partially cancel out the tides of the moon; The neap tides are lower than usual on the Earth. Eclipses - When the moon's shadow strikes the Earth, people on Earth within that shadow see the sun covered by the moon(During New Moon), or a solar eclipse . When the moon passes into the shadow of the Earth, people on the night side of the Earth see the moon darken,(During Full Moon) or a lunar eclipse . 6
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ASTRONOMY DSST 05Mar2012 Earth’s Rotation/Orbit/Seasons: Precession - is a slow, conical motion of the Earth's axis of rotation caused by the gravitational torque of the moon and the sun on the Earth's equatorial bulge. The Earth's rotation axis is not fixed in space; it is moving like the top of a wobbly top.
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