Apollo moon rocks hint at other planet that hit young earth

Thu Jun 5, 2014 3:32pm EDT

Related Topics

(Reuters) - Lunar rocks brought back by the Apollo astronauts more than 40 years ago contain evidence of a Mars-sized planet that scientists believe crashed into Earth and created the moon, new research shows.

German scientists using a new technique said they detected a slight chemical difference between Earth rocks and moon rocks. Scientists said more study would be needed to confirm this long-elusive piece of evidence that material from another body besides Earth contributed to the moon’s formation some 4.5 billion years ago.

Scientists believe the moon formed from a cloud of debris launched into space after a Mars-sized body called Theia crashed into young Earth.

Different planets in the solar system have slightly different chemical makeups. Therefore, scientists believed moon rocks might hold telltale chemical fingerprints of whatever body smashed into Earth.

Until now, evidence was elusive.

“We have developed a technique that guarantees perfect separation,” of oxygen isotopes from other trace gases, Daniel Herwartz, with the University of Cologne in Germany, wrote in an email to Reuters.

"The differences are small and difficult to detect, but they are there,” added Herwartz, lead author of a paper on the discovery published in this week’s issue of the journal Science.

The results indicate that composition of the moon is about 50 percent Thea and 50 percent Earth, the scientists said, although more work is needed to confirm that estimate.

The team analyzed rocks brought back to Earth by NASA astronauts during the Apollo 11, Apollo 12 and Apollo 16 missions to the moon, which took place in 1969 and 1972.

“This work is the first to claim to see such a difference in the isotopes of oxygen,” said Robin Canup, a planetary scientist with the Southwest Research Institute in Boulder, Colorado, who was not involved in the research.

“The reported difference between the Earth and moon is extremely small, small enough that I think there will be debate as to whether the difference is real or an artifact of how one interprets the data,” she added.

Meanwhile, other teams of scientists have been looking at titanium, silicon, chromium, tungsten and other chemical elements, but so far the lunar samples show no detectable differences from Earth samples.

(reporting by Irene Klotz)

FILED UNDER:
We welcome comments that advance the story through relevant opinion, anecdotes, links and data. If you see a comment that you believe is irrelevant or inappropriate, you can flag it to our editors by using the report abuse links. Views expressed in the comments do not represent those of Reuters. For more information on our comment policy, see http://blogs.reuters.com/fulldisclosure/2010/09/27/toward-a-more-thoughtful-conversation-on-stories/
Comments (4)
This would be a good confirmation of the current accepted theory for the Moon’s formation.

Science is such a cool thing, for those that understand it, why is the American right so scared of science? is it pure ignorance, religious dogma or both?

Jun 05, 2014 4:28pm EDT  --  Report as abuse
Randy549 wrote:
Very cool discovery; it will be interesting to see the debate on whether the differences are due to the interpretation of the data or not (as mentioned in the article).

Leave it to USAPragmatist2 to turn every article discussion into a diatribe against people he disagrees with. Sigh.

The “American right” isn’t scared of science. The people you speak of exist only in your personal, grudge-focused universe. Don’t use such a broad brush to lump everyone into a single category.

Jun 07, 2014 10:54pm EDT  --  Report as abuse
MarkmBha1 wrote:
What else would have caused the formation of the moon?

Jun 08, 2014 1:24pm EDT  --  Report as abuse
This discussion is now closed. We welcome comments on our articles for a limited period after their publication.