# GSU ASTR 1010 - Review for Final (3 pages)

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## Review for Final

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Review for Final

- Lecture number:
- 23
- Pages:
- 3
- Type:
- Lecture Note
- School:
- Georgia State University
- Course:
- Astr 1010 - Astronomy of the Solar System
- Edition:
- 1

**Unformatted text preview:**

ASTR 1010 Edition 1st Lecture 23 Outline of Last Lecture I Comets II Asteroids III Meteors Outline of Current Lecture I Review A Definitions Current Lecture I Review A Definitions 1 Aphelion the point at which an object is furthest from the sun 2 Perihelion the point at which an object is closest to the sun 3 AU Astronomical Unit average Earth to Sun distance 93 million miles 4 Geocentric Model Ptolemy believed universe revolved around the Earth Attempted to explain retrograde motion 5 Heliocentric Model Copernicus believes the Sun was the center 6 Wavelength distance between points of the same phase in adjacent waves 7 Frequency number of crests or cycles passing a point per unit 8 Period 1 frequency or 1 f 9 Speed Wavelength x frequency 10 Electromagnetic Spectrum In order of increasing frequency Gamma X Ray UV Visible red orange yellow green blue violet Infrared Radio 11 Newton s Laws Any object in motion will stay in motion unless acted upon by an unbalanced outside force Force mass x acceleration Every action has an equal and opposite reaction 12 Kepler s Laws The orbit of each planet is an ellipse with the sun at its focus As the planet moves around in its orbit it sweeps out equal orbits in equal time More distant planets orbit the sun at slower average speeds obeying the relationship p2 a 3 13 Newton s Universal Law of Gravitation Every mass attracts every other mass Attraction is directly proportional to the product of their masses Attraction is inversely proportional to the square of the distance between their centers Formula Fg G M 1 M2 d2

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