Lunar Kipuka!

What do you call an island surrounded by lava flows? The Hawaiians call it a Kipuka! Now here’s a Kipuka found on the Moon!

A lunar kipuka imaged by NASA’s LRO. A crater breached and filled with the lava flows of Mare Imbrium. Source: LROC Blog

The dark regions of the Moon — the Maria (plural for Mare) — were once seas filled with lava. And the kipuka shown above (which is 2.7 km across) was originally an impact crater on the ancient lunar surface. Then something interesting happened. The flowing lava during the time of active volcanism breached the western wall of the crater (leftside in the image) and filled it nearly to the rim.

The rim is thus the only remnant of the local lunar surface before the surface was drowned in the lava flows several billion years ago. So while the material inside the crater is relatively new, the rim itself is much older!



Leave a Reply

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Create a website or blog at

Up ↑