There are four planets in our solar system with rings: Jupiter, Saturn, Uranus and Neptune. This is interesting; it suggests that gas giants (even one with the mighty gravitational pull of Jupiter) are less apt to pull the rubble, which planetary rings consist of, inward.
Today's Question:
What is it called when one tectonic plate sinks under another?
I don't know this answer but would guess it's a rift?
(Sources: American Mensa, email transmission, September 8, 2011; http://nineplanets.org/jupiter.html; http://nineplanets.org/saturn.html; http://solarsystem.nasa.gov/planets/profile.cfm?Object=Uranus; http://www.solarviews.com/eng/neptune.htm; http://www.solstation.com/stars/jovians.htm; http://www.kidsgeo.com; http://pubs.usgs.gov/gip/dynamic/tectonic.html)
Compiled by Otto and Patricia Ladensack
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