How Does the Theory of Planetary Migration in Disks Possibly

question 22

Multiple Choice

How does the theory of planetary migration in disks possibly account for the highly eccentric orbits discovered for some extrasolar planets?

• A)When migrating planets pass close enough for a gravitational encounter, one may be flung from the system while the other is shifted to a highly elliptical orbit.
• B)When migrating planets collide, they would move onto more eccentric orbits.
• C)When a planet migrates onto the surface of the star, the additional stellar mass would disrupt the orbits of the remaining planets.
• D)A migrating planet would create waves in the planet forming disk, which would in turn lead to the formation of planets on highly elliptical orbits.

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Definitions:

Prokaryotic

Describing organisms, such as bacteria and archaea, that lack a nucleus and other membrane-bound organelles in their cells.

Repressor Protein

A protein that binds to specific DNA sequences, thereby inhibiting the transcription of genetic information from DNA to messenger RNA.

RNA Synthesis

The process by which ribonucleic acid (RNA) molecules are created from DNA templates in cells, essential for gene expression and regulation.

Enhancers

Genetic elements that increase the transcription of specific genes, playing a key role in regulating gene expression.