ASTR LEC 3 (09_14_22)

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Brock University *

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1P91

Subject

Astronomy

Date

Oct 30, 2023

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pdf

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1

Uploaded by DeanTankCrab23

ASTR1PO1 Astronomy Tuesday, Sept. 14, 2022 Let’s Calculate The Size of The Observable Universe: Size = 93 billion ly = 93 x 10^9 ly (ly = lightyear) 1 ly = 9.5 trillion km = 9.5 x 10^12 km Quiz: Who can calculate the size in km? Predic: 8.835 × 10 23 Size of the observable universe = apprx.10 3 x More Math: Negative Powers of 10 - 10^-n where n is any positive integer means 1 divided by 10^n 10^-n = 1/10 - 10^-n can also be written as n zeros followed by a 1 with a decimal point after the first zero. (like an inverted 10^n) ● Most things we can see or detect, like stars planets and humans, are made of atoms ● Every atom is composed of a nucleus surrounded by a cloud of electrons ● The nucleus itself is made of protons and neutrons each of which is around 100,000 times smaller than an atom Atomic Scales - Size of an atom: 10^-10 m = 0.000 000 000 1m - Size of a nucleus: 10^15- Electrons don’t orbit te nucleus, they’re “probability clouds”
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