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http://www.dearastronomer.com/
To clarify, Earth has the highest size/mass ratio of all planets, yes, even Jupiter and Saturn.
The “gas giants” are much, much more massive, but are comprised almost entirely of gas.
On the topic of density, Saturn is actually less dense than water!
If you had an ocean big enough, Saturn would float like a beach ball.
Ray Sanders is a Sci-Fi geek, astronomer and blogger. Currently researching variable stars at Arizona State University, he writes for Universe Today, The Planetary Society blog, and his own blog, Dear Astronomer
2012-12-04 08:04:58