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Migrating planets

March 16, 2016 | Author: | Posted in astronomy, nature

Migrating planets Abstract

The includes a of the revolutionary theory in astronomy related to the history of formation of the solar system . Based on the reading in Scientific American , Migrating Planets ‘ by Renou Malhotra (1999 , the author summarizes the essence of the theory , basic supporting arguments and evidence . More recent materials serve as proof that the theory of planet migration is gaining popularity in the scientific world . The conclusion offers the author ‘s perspective on the given theory and perspectives for its development The contemporary theory of solar system development [banner_entry_middle]

is based on one basic assumption . It proceeds from the belief that modern planets were born in their orbits . The large planets in the solar system are believed to have formed in a two-step process . In the first stage , the core emerged as a conglomeration of solid planetesimals that later attracted a huge gas disk from the nebula around . This theory of planet formation has existed for decades , underpinning most of astronomical research of the solar system

However , today scientists begin to question these basic assumptions and advance new theories of planet formation that have the potential to change the way we conceptualize the early years of our planet system Thus , Renou Malhotra (1999 ) insists that planets may be now traveling in orbits far removed from those in which they were born . Gravitational interactions with other planets , impact of other bodies in the solar system including asteroids and comets , and formational processes within planets themselves may have altered the original orbits of the planets

The evidence corroborating this idea is present in the first place in the studies of Pluto , an oddity among others in the solar system . This planet stands out from among others since it is thousands of times less massive than the four gas-giant outer planets , and its orbit is very different from the well-separated , nearly circular and co-planar orbits of the eight other major planets (Malhotra , 1999 . The planet moves at a varying distance from the sun that ranges from 29 .7 to 49 .5 astronomical units . Besides , the correlation in movement between Neptune and Pluto is amazing , since the two planets cross each other ‘s orbits but never collide , with their orbits protected by so-called resonance libration . This means that in the same time period Pluto makes two , and Neptune three revolutions around the sun

To explain this eccentric orbit , Renou Malhotra proposed that Pluto was born somewhat beyond Neptune and initially traveled in a nearly circular , low-inclination orbit similar to those of the other planets but that it was transported to its current orbit by resonant gravitational interactions with Neptune (Malhotra , 1999 . The scientist develops a theory that is related to the scattering or accretion of plantesimals by planets in the early stages of their formation . Neptune , after gaining orbital energy due to massive scatterings , migrated outward , and so did Saturn and Uranus . The reverse happened to Jupiter that moved inward losing orbital energy and thus preserving the sum point

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