Transcript Exo-planets

EXO-PLANETS
Size
 Most Exo-planets are smaller than earth
 A common Exo-planet is around one-twelfth
the size of earth (1,250-1,800 km in diameter)
 This is also about half
the size of Pluto
Sedna
1,300-1,600 km in
diameter
Quaoar
Pluto
Moon
Earth
1,250 km
2,302 km
3,476 km
12,756 km
Colors and Surface Features
 Exo-planets all have wide ranges of colors
and surface features
 Sedna, a well known planet, is
trans-Neptune and composed
of many different elements
 It is one of the reddest planets
 Quaoar, another planet is a rocky
trans-Neptune planet that is
moderately red
Rotation and Revolution
 Again, Exo-planet revolutions and rotations
vary
 Sedna a common exo-planet rotation is 10
hours, and its revolution is
around 11,400 years
The orbit of Sedna (red) set
against the orbits of Jupiter
(orange), Saturn (yellow),
Uranus (green), Neptune (blue),
and Pluto (purple)
Density
 Exo-planets vary in density
 Two common Planets, Sedna and Quaoar
have densities that are very similar
 Sedna has a density of about 2.0 g/cm3
Quaoar has a density of 2.2 g/cm3
Density
 This is about ½ the
density of Earth
6
5
4
3
2
1
0
Sedna
Quaoar
Pluto
Density
Earth
Gravity
 Exo- Planets have ranges of gravity
 Sedna’s gravitational pull is about 0.27 m/s2
 Quaoar’s gravitational pull is around 0.376m/s 2
 Earth’s gravity is 9.78 m/s²
 In relation, you would practically fly on Sedna
and Quaoar, since there
pull is 1/10 that of Earth’s
Gravity
12
10
8
6
4
2
0
Sedna
Quaoar
Gravity
Earth
Atmospheric Composition
 Atmospheres on exo-planets can vary often
 Sedna, a common exo-planet does not have an
atmosphere, but might contain one someday
 Quaoar, another example, also does not contain
a known atmosphere
 Both may one day posses an atmosphere due to
elements present
Interpretation of the view of the sun
form Sedna
Surface Composition
 Most exo-planets surfaces are rocky and
terrestrial
 Due to limits on space technology there are
limits on what we know about the surface
composition of exo-planets
Interpretation of
Quaoar’s surface
Interior Composition
 A majority of exo-planet interior’s are
composed of ice-like materials, and a solid,
rocky core
Magnetic Field
 Again, detecting the magnetic fields of exo-
planets around us is highly complicated
 So far no magnetic fields have successfully
been proven as detecting them is very
complex
 All exo-planets are
thought to have a
magnetic field
Moons
 Variation in the amounts of moons is
common in exo-planets
 Sedna, for example, has no known moons
 Quaoar, has one moon, called Weywot, its
revolution is around 12.9 days and has an
equatorial diameter of about 85 km
Weywot, Quaror’s
moon, is theorized to
appear like so
Unique Features of Exo-planets
 Exo- means outside
 There are over 200 known exo-planets
 Exoplanet: a planet that orbits the sun
outside Pluto or another star
Exo-planet 51 Pegasi B, one of the
first discovered exo-planets
Exoplanets
Size: Usually smaller than Earth Sedna: 1,300-1,600 km
Quaoar: 1,250 km
Color/Surface Features: wide range……commonly red
Rotation: Sedna: 10hours
Revolution: Sedna: 11,400 years
Density: about ½ of earth’s density
Gravity: most are 1/10 that of earth
Atmospheric Composition: Little to no atmosphere
Surface Composition: Rocky terrestrial surface, probably icy
Interior Composition: Unverified, probably icy mantle, rocky solid core
Magnetic Field: all exo-planets thought to have a magnetic field
Moons: None to many
Sedna: None
Quaoar: 1/Weywot/85km diameter
Unique Features: over 200 known exo-planets