Published on StarDate Online (https://stardate.org)

Home > Building Solar Systems II

Building Solar Systems II [1]

Call it sibling rivalry.

The planets in young solar systems constantly push and pull each other. This shoving match alters the orbits of the planets, deciding where each planet ends up -- and even which planets survive.

This concept is borne out by the discovery of hundreds of planets in other star systems. Many of the planets are giants, but they're in tight orbits around their parent stars. Under current models of how planets form, there's just no way for such a planet to take shape so close to its star. That means the planet must have been born farther out, but moved inward, toward the star.

One way to do that is through interactions with other planets -- and especially other giant planets. The gravity of such worlds is strong, so it effects the orbits of other objects around it.

In our own solar system, the gravity of Jupiter probably threw billions of "leftovers" from the birth of the planets completely out of the solar system. These interactions pushed Jupiter itself closer to the Sun.

Similar interactions are common in other star systems, too. But so are interactions between the planets themselves. These interactions push the planets into orbits that are lopsided or tilted. They can even push a planet so close to its parent star that it gets torn apart or gobbled up.

Eventually, the surviving planets reach a balance, so they form a stable system -- a family of siblings that have learned how to get along.

More tomorrow.

Script by Damond Benningfield, Copyright 2010

Keywords:

  • Exoplanet [2]
  • Planetary Formation [3]
  • Solar System [4]
StarDate: 
Tuesday, August 24, 2010
Teaser: 
Rivalry among planetary siblings
  • About StarDate
  • Underwriting
  • SkyTips Sign-Up
  • Change mailing address
  • Privacy Policy
  • Copyright and Usage
  • Contact

StarDate is brought to you in part through the generous support of our underwriters.
Interested in underwriting? Let us know
.

Friends and Family of Lynn BrillYarCom Inc. and the Lott FamilyUniverse

FacebookTwitterYouTube

©2018 The University of Texas McDonald Observatory


Source URL: https://stardate.org/radio/program/building-solar-systems-ii

Links
[1] https://stardate.org/radio/program/building-solar-systems-ii
[2] https://stardate.org/astro-guide/exoplanet
[3] https://stardate.org/astro-guide/planetary-formation
[4] https://stardate.org/astro-guide/solar-system