ASTR 3 Lecture Notes - Lecture 2: Scientific Method, Angular Diameter, Scientific Theory
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1 meter=3. 3 feet; 1 kilometer=6 10th of a mile=1000 meters. The distance between stars: proxima centauri is the nearest star found until now, which is 265,608 au away. 1 light year=distance light travels in one year=63240 au=9. 46*1012 km. Cosmic microwave background: distance to the edge of the observable universe = The earth is about 14 billion years old, and the earth is 4. 5 billion years old, but a (cid:28705)(cid:28666)(cid:28660)(cid:28672)(cid:28672)(cid:28660)-(cid:28677)(cid:28660)y (cid:28661)(cid:28680)(cid:28677)(cid:28678)(cid:28679)(cid:28706) (cid:28662)(cid:28660)(cid:28673) (cid:28667)(cid:28660)(cid:28675)(cid:28675)(cid:28664)(cid:28673) (cid:28668)(cid:28673) (cid:28660) (cid:28665)(cid:28664)w (cid:28672)(cid:28668)(cid:28671)(cid:28671)(cid:28668)(cid:28678)(cid:28664)(cid:28662)(cid:28674)(cid:28673)(cid:28663)(cid:28678). Th(cid:28664) (cid:28678)(cid:28680)(cid:28673) w(cid:28660)(cid:28678)(cid:28673)"(cid:28679) (cid:28674)(cid:28673)(cid:28664) (cid:28674)(cid:28665) (cid:28679)(cid:28667)(cid:28664) (cid:28665)(cid:28668)(cid:28677)(cid:28678)(cid:28679) (cid:28678)(cid:28679)(cid:28660)(cid:28677)(cid:28678). Cambrian: ---animal life developed, ample fossils during that period. primates: . Scientific theory: not necessarily true, such as conspiracy theories. The constellations: they are not actually physically associated with each other. They are bright and relatively close to earth so that we can see them with human eyes. We measure positions on earth with latitude and longitude, and we think of the sky (cid:28660)(cid:28678) (cid:28660) (cid:28662)(cid:28664)(cid:28671)(cid:28664)(cid:28678)(cid:28679)(cid:28668)(cid:28660)(cid:28671) (cid:28678)(cid:28675)(cid:28667)(cid:28664)(cid:28677)(cid:28664). I(cid:28679)"(cid:28678) (cid:28669)(cid:28680)(cid:28678)(cid:28679) (cid:28679)(cid:28667)(cid:28664) (cid:28664)(cid:28660)(cid:28677)(cid:28679)(cid:28667)"(cid:28678) (cid:28678)(cid:28662)(cid:28660)(cid:28671)(cid:28664) extended to the universe.
