ASTA01H3 Study Guide - Midterm Guide: Planetesimal, Curve, Lunar Eclipse
Document Summary
Spiral arms extend from the center to the edge of the disk of spiral galaxies constellation: one of the stellar patterns identified by name, usually of mythological gods, people, animals, or objects. Also, the region of the sky containing that star pattern asterism: a named grouping of stars that is not one of the recognized constellations magnitude scale: the astronomical brightness scale. The larger the number, the fainter the star apparent visual magnitude (mv): a measure of the brightness of a star as seen by human eyes on earth flux: a measure of the flow of energy out of a surface. One cycle takes nearly 26000 years horizon: the circular boundary between the sky and earth. Zenith: the point in the sky directly above the observer nadir: the point on the celestial sphere directly below the observer; the opposite of the zenith.
