Class Notes (837,186)
Canada (510,155)
Astronomy (103)
ASTA01H3 (77)
Lowman (12)
Lecture 2

lecture 2-3

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Department
Astronomy
Course
ASTA01H3
Professor
Lowman
Semester
Fall

Description
Lecture 2If Sun was a basketballMoon is ball pointEarth is 4 time larger than ball point1 Sun radius100 Earth radius Universe The totality of all space time matter and energy dark matter dark energy131 Light Year10 trillion km or 10kmIt takes 8 18 seconds minutes from light to travel from the sun to the ErathThis galaxy is 100 000 light years acrossThis galaxy is called a spiral arm galaxyStars we can see with the naked eye are all members of the milky way galaxyPolaris star is due NorthStars that appear close to the sky may not be close in spaceoo16036001296000360MoonSun have angul
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