Personal Liberty Digest™ will be upgraded this weekend to reflect a dynamic new look and mobile-friendly viewing to enhance your experience! Plus, we'll be providing even more of the compelling content you've come to expect, delivered in a whole new way!

  Comments Subscribe to Personal Liberty News Feed Subscribe to Personal Liberty
 

Did Earth Once Have Two Moons?

SANTA CRUZ, Calif., Aug. 3 (UPI) — Earth may have once had two moons that collided, leaving an asymmetry in our companion’s shape that has long puzzled scientists, a U.S. researcher says.

In an article published this week in Nature, Erik Asphaug, a planetary scientist at the University of California, Santa Cruz, suggests the two bodies merged in a slow-motion collision lasting many hours that created a mysterious mismatch between the moon’s visible side and its remote far side.

The moon’s visible side is dominated by low-lying lava plains, while its far side is composed of highlands. The differences, however, go below the surface, as the thickness of the moon’s crust and the minerals found below the surface vary between the two regions, Asphaug and co-author Martin Jutzi of the University of Bern said.

Asphaug suggests something squeezed some of the moon’s layers to one side, and that a collision with a smaller moon about 600 miles in diameter is the most likely explanation.

“By definition, a big collision occurs only on one side,” he says, “and unless it globally melts the planet, it creates an asymmetry.”

Following the slow-motion impact, Asphaug says, gravity would have squeezed the material of the smaller body to a relatively thin layer on top of the moon’s existing crust.

UPI - United Press International, Inc.

Since 1907, United Press International (UPI) has been a leading provider of critical information to media outlets, businesses, governments and researchers worldwide.

Facebook Conversations

Join the Discussion:
View Comments to “Did Earth Once Have Two Moons?”

Comment Policy: We encourage an open discussion with a wide range of viewpoints, even extreme ones, but we will not tolerate racism, profanity or slanderous comments toward the author(s) or comment participants. Make your case passionately, but civilly. Please don't stoop to name calling. We use filters for spam protection. If your comment does not appear, it is likely because it violates the above policy or contains links or language typical of spam. We reserve the right to remove comments at our discretion.

Is there news related to personal liberty happening in your area? Contact us at newstips@personalliberty.com

Bottom
close[X]

Sign Up For Personal Liberty Digest™!

PL Badge

Welcome to PersonalLiberty.com,
America's #1 Source for Libertarian News!

To join our group of freedom-loving individuals and to get alerts as well as late-breaking conservative news from Personal Liberty Digest™...

Privacy PolicyYou can opt out at any time. We protect your information like a mother hen. We will not sell or rent your email address to anyone for any reason.