In our absence, Mike B did a whole range of really
careful experiments dropping balls into sand. It seems
a kind of madness to be trying to scale up from ball-bearings
in sand to a stonking great meteorite, but what else
can we do?
We tried a bullet, which has huge speed but only a
small mass, so it didn't help us as much as we hoped.
The end of the challenge was the usual fight with daylight
fading fast and last-minute traumas. We were so close
with our estimate it was unbelievable - sheer fluke
really, our errors were simply HUGE.
Jonathan and Ellen's telescope was a magical creation.
The moon looked beautiful and its craters unbelievably
clear. An amazing way to finish an amazing challenge!