64-190 Study Guide - Comprehensive Final Exam Guide - Earth, Sun, Wavelength
20 Nov 2018
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If (cid:455)ou (cid:272)a(cid:374)"t test it or prove it is not useful: continually test theories, revise if needed. Think gravity laws exist in other solar systems. In astronomy the numbers are huge: scientific notation, representing numbers in a condensed form, ex. 4,570,000,000,000,000,000,000,000 = 4. 57 x 1024: means multiply 4. 57 by 1 with 24 zeros to get the big number back, the power to 24 tells us how many decimal places we moved over to the left. If it"s a positi(cid:448)e e(cid:454)po(cid:374)e(cid:374)t its to the left: we should only one digit before the decimal, can also use it to represent very small numbers. If moving the decimal to the right, the exponent will be a negative number: ex. In one second light would travel around earth 7 times: astronomy is a glimpse in to the past, when we are observing these distant objects we are looking at them as they were in the past, ex.
