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Lecture 13

AS101 Lecture Notes - Lecture 13: Moon, Mars 2, Space Debris


Department
Astronomy
Course Code
AS101
Professor
Patrick Mc Graw
Lecture
13

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Astronomy Lecture 13
Uranus
- Distance from sun 19AU
- Size 4 x earth
- Mass 15 x earth
- Composition hydrogen, helium, and methane atmospheres slushy interior (rocks, water,
methane); heavy element core
- 27 moons and ring system
- Axis of rotation is tilted at 98 degrees
Neptune
- Distance from sun 30AU
- almost same as Uranus
Terrestrial
Jovian
Mass -
Composition, density - rocks, metals
Hydrogen, Helium, slushy interior
Moons earth 1 moon, mars 2 moons, Jupiter 67.
Jovian has more moons
Rings No
Yes
Pluto
- size 0.19 x earth
- distance 39 AU
- moons 5
- rocky/icy surface
Space Debris
- The total mass of all the other objects is less than that of the earths moon
- Includes asteroids (500,000) known
- Comets estimated 10^8 to 10^12
Asteriods
- Found throughout solar system but mostly between mars and Jupiter
- Average separation in asteroid belt is 1.3 million km
- Rocky/metallic composition
Comets are dirty snowballs
- Icy nucleus 10s of km across
- Composition rock +ices
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