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Lecture

AST101H5 Solar System Astronomy (3RD)

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Department
Astronomy
Course
AST101H5
Professor
John Lester
Semester
Fall

Description
chapter 1 Which is the nearest star? • not polaris (north star)­434 light years • not sirius (brightest star) 8.6 • proxima centauri alpha centauri c • a member of the centauri alpha centauri system of 3 stars: a, b, & c • 3rd brightest how old is the solar system 5 billion years 5x 10^9  very slow changes alter the earth and sun over deep time solar system has not been here forever there was a time before our solar system time distance connection light travels at the fastest possible speed  300,000 km/s light need a significant amount of time to travel the large astronomical distances when we observe an astronomical object, we see it as it was in the past, when the light  started toward us there is a lag example If the sun changes "now" we won't see that until 500sec later Is earth moving? even though we feel stable it is an illusion because we are moving we must leaner to measure earths motions earth is rotating one spin takes one day the speed of rotation is high at earth's equator speed = circumference/ 24 hours piD earth/24= pi x 12756 km/24h= 1670 km/h at Mississauga we
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