there was a sill signilicant amount f gas left over from the formation of the Su
ID: 2269245 • Letter: T
Question
there was a sill signilicant amount f gas left over from the formation of the Sun. Jupiter swept up this gas creating an extensive atmosphere tens of thousands of kilometers thick. This compares to Earth's 100-km thick atmosphere. The four outer planets Jupiter, Saturn, Uranus, and Neptune may have formed close to one another near the Sun's "snow line" at 5 AU. During the latter stages of the accretion process, these planets dispersed with Jupiter moving inward toward the Sun and Satu, Uranus, and Neptune moving outward. 20 30 Snow 5 A.U. A.U This dispersal of the planets is called migration. Neptune may have migrated outward as much as 7-10 its original position in the solar s ystem whereas Jupiter migrated inward only 1 or 2 A.U. Migration was caused by the four outer planets dispersing the boulders of rocks and ice i.e., the "planetary building bricks" not accreted by the outer planets). This gravitational interplay caused the planets to migrate and the much smaller boulders to be hurled out of the plane of the planets forming a huge spherical shell called the Oort Cloud Oort Cloud of Ice Boulders Planets a) Explain the process ofphtnetaty accretion and b) Calculate the distance across the Oort cloud in c Calculate how long it takes light to travel from migration kilometers and miles. one edge of the Oort cloud to the other in seconds and years. [Note: The number of years gives the extent of the solar system measured in light years.]Explanation / Answer
a)Accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter in an Accretion disk.
Migration in planets occurs when a planet or other stellar interacts with a disk of gas or planetesimals, resulting in the alteration of the satellite's orbital parameters, especially its semi-major axis.
b) According to Kepler's law,
distance2 = radius3
Distance across oort cloud for Jupiter= (69911)3/2
=1.84×107 km
For Saturn= (58232)3/2= 1.4 ×107 km
For Uranus=(25362)3/2= 4.03 ×106 km
For Neptune=(24622)3/2= 3.86 ×106 km
C)Light travels a speed of 9.46× 1012 km/year
For light to travel through oort cloud ,it takes,
For Jupiter=(1.84 ×107)/(9.46 ×1012) =1.94 ×10-6 years
For Saturn=(1.4 ×107)/(9.46 ×1012) =1.47 ×10-6 years
For Uranus=(4.03 ×106)/(9.46 ×1012)=4.26 ×10-7 years
For Neptune=(3.86 ×106)/(9.46 ×1012)=4.08 ×10-7 years
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