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Lecture 1

PHYS 170 Lecture 1: Astronomy week 1

1 pages91 viewsFall 2016

PHYS - Physics
Course Code
PHYS 170

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Chapter Zero
Universe: Totality of all space, time, matter and energy.
Scales are very large, measured in light-years, the distance light travels in a year is about
10 trillion miles
Without liquid water there can be no chemical reactions which could create life
Stars that appear close together in the sky does not mean that they are close together in
Latitude: Used to locate things on earth, 0 degrees is located on the equator
Declination: used to locate things in space, horizontal, celestial analog of latitude
Longitude: used to locate things on earth, 0 degrees is located in Greenwich, England
Right Ascension: used to locate things in space, vertical, celestial analog of longitude
Solar Day: 24 hour period
Zodiac: arrangement of stars in the sky
Reason for the seasons: Tilt and amount of direct sunlight
Procession: Earths axis changing over the course of time
Lunar Distance: 250,000 miles
Lunar Cycle: About 29 days
Ecliptic: the sums equator and the plane that the planets are on
Eclipse: When the moon blocks the sun or the earth’s shadow blocks the moon
oTypes of Eclipses
Lunar- When the earth’s shadow blocks the moon
Solar- When the moon blocks out the suns view
Ultraviolet rays from the sun gets blocked out by the ozone layers
Solar Eclipse
oUmbra: Sun completely obscured
oPenumbra: Sun partially visible
Space Weather Environment
We live in the outer atmosphere of a highly variable magnetic start  the sun
Main gas in the sun hydrogen
Gravity affects thing with mass
Fusion powers our sun and all stars
Astronomical Unit: 93 million miles
Sun spots have cycles
oThe sun spots on the sun are dark because they’re cooler temperature wise.
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