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Name: Anne
Status: educator
Grade: K-3
Location: CO
Country: USA
Date: N/A


Question:
Could a rocky planet have rings like Saturn or Jupiter?



Replies:
There is no reason why a rocky planet could not have a ring system.

Howard Barnes,
Astronomer.


Hi Anne,

There are several theories of how the rings of Saturn and Jupiter formed. One of the theories is that the rings are remnants of a moon that came close enough to the planet so that the tidal forces ripped it apart. Another is that the rings were formed from collisions of moons or asteroids. A third theory is that the particles are remnants from the early formation of the planet itself - particles that did not merge with the planet.

As you can imagine, depending on which theory is true - and there are data supporting one theory over another so that it is still too early to tell which theory is the most likely, then it would answer whether rocky planets can have rings. If tidal forces is what form rings, than rocky planets with lower masses might not form rings - or the debris would be too close to stay in orbit very long. If rings are formed by collisions, than debris rings can form around any type of planet. If rings are formed from particles that did not join the planet during its formation, than again, these rings would have to be at a distance which balances the gravitational and tidal forces. It's possible to have them around rocky planets but it would have to be a confluence of several factors that create them.

Greg (Roberto Gregorius)
Canisius College



Anne

From the following article on the on-line encyclopedia Wikipedia:
http://en.wikipedia.org/wiki/Planetary_ring

"There are three ways that planetary rings (the rings around planets) have been proposed to have formed: 1) from material of the protoplanetary disk that was within the Roche limit of the planet and thus could not coalesce to form moons; 2) from the debris of a moon that was disrupted by a large impact; or 3) from the debris of a moon that was disrupted by tidal stresses when it passed within the planet's Roche limit."

So, yes, a rocky planet can have rings like Saturn or Jupiter.

Sincere regards,
Mike Stewart
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