In a few hours—not long after this blog post is published—we should know whether or not the washing-maching sized probe Philae has successfully landed on comet 67P/Churyumov-Gerasimenko. The operation is very complicated, this is a moving and spinning comet with a boulder-strewn surface dotted with ice spires. And as of a few hours the lander was having problems with the gas thrusters designed to slow the lander to a hover above the comet surface. Space is hard. So to explain what is happening and the scale of the things involved, we have an illustration from the Washington Post.
Credit for the piece goes to Bonnie Berkowitz, Patterson Clark, and Richard Johnson.