|How did this spherule come to be on the Moon?
When a meteorite strikes the Moon, the
of the impact melts some of the
a fraction of which might cool into tiny
Many of these
glass beads were present in lunar soil samples returned to Earth by the
Pictured above is one such glass
that measures only a quarter of a
is particularly interesting because it has been victim to an even smaller impact.
A miniature crater is visible on the upper left, surrounded by a fragmented area caused by the
shockwaves of the small impact.
many of these
astronomers can estimate the history of
cratering on our Moon.
(UCB) et al.,
Apollo 11 Crew,