'What's this thing coming towards me very fast? ... That's it! Ground! I wonder if it'll be friends with me?' ... Artist's impression of Nasa's Lunar Crater Observation and Sensing Satellite (LCROSS) crashing into the moon. Photograph: Reuters 'What's this thing coming towards me very fast? ... That's it! Ground! I wonder if it'll be friends with me?' ... Artist's impression of Nasa's Lunar Crater
![Nasa's LCROSS lunar mission uses Hitchhiker's Guide to the Galaxy | Books | guardian.co.uk](https://cdn-ak-scissors.b.st-hatena.com/image/square/8e982005cfb17e13be2f3a31ea315c439a920752/height=288;version=1;width=512/https%3A%2F%2Fi.guim.co.uk%2Fimg%2Fstatic%2Fsys-images%2FBooks%2FPix%2Fpictures%2F2009%2F10%2F12%2F1255348088406%2FIllustration-of-NASAs-LCR-001.jpg%3Fwidth%3D1200%26height%3D630%26quality%3D85%26auto%3Dformat%26fit%3Dcrop%26overlay-align%3Dbottom%252Cleft%26overlay-width%3D100p%26overlay-base64%3DL2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctYWdlLTIwMDkucG5n%26enable%3Dupscale%26s%3D388b62778d621d37e4c4b14383b33378)