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astronomy 100 lecture notes - Astronomy 100 Lecture notes...

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Astronomy 100 Lecture notes Chapter 1 How are stars formed? Interstellar gas + dust = Incubator for new generation of stars They are held together by the force of gravity. Black Holes- The regions of space where matter is so dense that it can not radiate light. Constellation- Used by astronomers to describe an entire area of the sky and the objects in it. The celestial sphere (sky map) is divided into 88 constellations. Zenith- The highest point of the sky Nadir- The lowest point of the sky You can only see the sphere above the horizon. Meridian- The point stretch through zenith to the other level (semi-circle) Diurnal motions of stars- Daily motions of stars. The stars move from East to West every 24 hours because of the rotation of the Earth. This motion has nothing to do with the 3D space motions of stars. As the Moon orbits Earth it moves from west to east. Midnight- Full Moon Between midnight and 6AM- Waning (decreasing) Gibbous Moon 6AM- Third quarter Moon
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