Boulders balance on tiny tips as comet 67P zooms through space
![](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/05/cc_p67_free.jpg?fit=860%2C460&ssl=1)
Three boulders (shown) balance precariously on comet 67P/Churyumov-Gerasimenko in this Sept. 16 image taken 29 kilometers above the surface by the Rosetta spacecraft
Rosetta/ESA, MPS for OSIRIS Team/MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA