Moon Zoo team member Katie sent me an e-mail with a link to an
article about a newly discovered lunar feature!! The feature is
a natural bridge likely formed by a dual collapse into a lava
tube. The one Katie linked to is one of 2 found in the impact
melt around King Crater on the lunar farside. This and a smaller
neighbouring bridge (also in impact melt material) are the only
examples of natural bridges that have been found on the Moon and
she asked if we could look out for some more. These are similar
to the lava tube skylights we are already looking for and might
be quite tricky to spot. Look out for 2 or more “holes” and some
evidence of sunlight shining through from one hole to another
showing that it really is a larger cavity spanned by a “bridge.”
You might come across bridges in impact melts (like the King
Crater bridge) or in rilles (valleys carved out by lava flows or
created by the collapse of lava tubes) running over the mare
basalts. Rilles may have some uncollapsed roofed over sections.
These ar