'gravity wells' - depiction of relative gravity in the solar system

This was rather eye opening for me, especially the part in the lower left hand corner about the difference between earth-to-moon travel and moon-to-earth travel. (The full-sized picture can be seen at [<a href="http://xkcd.com/681_large/" rel="nofollow">http://xkcd.com/681_large/</a>].)<p>This one also remdinds me of xkcd.com/657/, another one of his comics that probably took forever to make, but provides lots of information in a very easy to understand fasion.

There are two different values for Earth - one in the main diagram, and a larger one in the inset. What happen?

Sirens of titan! :)

I want this in poster form asap.

So, did anyone else catch the Kurt Vonnegut reference?

Poor Pluto

While I like XKCD, can we not XKCD on HN? It's not like you don't see good ones posted elsewhere.