AST-A 105 Study Guide - Midterm Guide: Primary Mirror, Semiconductor Detector, Solar Mass
Document Summary
Units of mass: 1 kg, earth= 6x10^24 kg, u(cid:374)"s (cid:373)ass = (cid:1007)(cid:1004)(cid:1004),(cid:1004)(cid:1004)(cid:1004) earth (cid:373)asses, 1m* (little circle)= 1 solar mass, most massive stars =100 m, our galaxy= 30 billion solar masses. Motions in the sky: latitude: location on earth along the meridian, earth spins, altitude: angle from horizon to an object, 2nd coordinate. Angles on a sphere: full circle- 360 degrees, horizon ( a circle, from n to s- 180 degrees, from horizon to zenith- 90 degrees. Finding ones latitude using polaris: n pole: lat=90, polaris alt: 90, equator: lat= 0, polaris alt: 0. Some planets are brighter than stars: venus- (cid:373)or(cid:374)i(cid:374)g or e(cid:448)e(cid:374)i(cid:374)g (cid:862)star(cid:863, brilliant, brightest of all planets. Binoculars: easier to use than telescopes and cheaper, field of view much larger, easier to look with both eyes, see 100,000 stars, many nebulae and clusters, stars are bright and colorful.
