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Lecture 18

AST101H1 Lecture Notes - Lecture 18: Cryovolcano, Protoplanet, Not ProvenPremium

Astronomy & Astrophysics
Course Code
Michael Reid

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AST101 – Lecture 18 – Dwarf Planets & Jovian Planets
Dwarf Planets
Dwarf Planets – celestial bodies that do not fulfill all conditions to be classified as a
planet such as whether the celestial body has its own distinct path
o*Celestial bodies are NOT classified as dwarf planets because they are small or
have a relatively smaller mass
oCeres, a dwarf planet
Could possibly be a surviving protoplanet - celestial body with collection
of matter that survived from the time and from within the disk where
planets were formed
Orbits in the main asteroid belt does not have its own cleared orbital
path dwarf planet
Photographed by the Dawn Spacecraft on May 7th, 2015
Not as heavily cratered
Has white, bright spots in a region on its North pole
-Possibly ice volcanoes Not proven
The spacecraft used a new technology called an ion engine
-Enabling it to orbit two different celestial objects without the
use of large amounts of fuel to escape the orbit of one
celestial object and into another
Evidence of erosion and few craters
Large smooth region as well
Has large ice mountains
Has atmosphere
Possibility of an ice volcano on Pluto
Charon - Pluto’s moon
Large breaks across the planet with craters below the break but
not as many above the vast crack
Jovian Planets
oJovian Planets
Consist mostly of light elements (H and He)
Mostly tiny solid cores with thick layers of liquid and gas
High masses
Rotate quickly
All Jovian planets have rings
Have dozens of moons
oComparison to Terrestrial Planets
Consists mostly of heavy elements such as C, Si, Fe, Ni, O
Mostly solid interior with thin or no atmosphere
Low masses
Rotate slowly
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