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The Daily Cosmos or Interesting Facts about the Universe

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The Daily Cosmos or Interesting Facts about the Universe

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Cosmology - Astrophysics - Astronomy

 

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Comment by Doone has Fremdschämen on August 15, 2018 at 10:10am
Comment by Davy on August 14, 2018 at 1:43pm

My Pleasure May the Big Bang Rip.
A comment earlier piqued my interest that put me to a wondering about the rocks from Selene as I had not seen any reference to what they are revealing to us about her and her relationship to Earth. 

Comment by Tom Sarbeck on August 14, 2018 at 1:36pm

Thanks, Davy, for the update.

I was working for a major Apollo program contractor during those years but long ago forgot the details your post describes.

Comment by Davy on August 14, 2018 at 1:33pm

NASA’s Apollo 15 Moon Rocks Reveal Death of Lunar Magnetic Field –“...

"Today the moon's field is essentially zero," says Benjamin Weiss, professor of planetary sciences at MIT. "And we now know it turned off somewhere between the formation of this rock and today."


New evidence from ancient lunar rocks suggests that an active dynamo once churned within the molten metallic core of the moon, generating a magnetic field that lasted at least 1 billion years longer than previously thought.

Dynamos are natural generators of magnetic fields around terrestrial bodies, and are powered by the churning of conducting fluids within many stars and planets. In a paper published today in Science Advances, researchers from MIT and Rutgers University report that a lunar rock collected by NASA's Apollo 15 mission exhibits signs that it formed 1 to 2.5 billion years ago in the presence of a relatively weak magnetic field of about 5 microtesla. That's around 10 times weaker than Earth's current magnetic field but still 1,000 times larger than fields in interplanetary space today.

Click on the headline to go to the page the rest of the report is on. 

Lunar Rocks

Comment by Davy on August 14, 2018 at 1:27pm

Between 1969 and 1972 six Apollo missions brought back 382 kilograms (842 pounds) of lunar rocks, core samples, pebbles, sand and dust from the lunar surface. The six space flights returned 2200 separate samples from six different exploration sites on the Moon. In addition, three automated Soviet spacecraft returned important samples totaling 300 grams (approximately 3/4 pound) from three other lunar sites. The lunar sample building at Johnson Space Center is the chief repository for the Apollo samples. The lunar sample laboratory is where pristine lunar samples are prepared for shipment to scientists and educators. Nearly 400 samples are distributed each year for research and teaching projects.

Astronaut collecting soil sample

Astronaut collecting lunar soil sample.

Study of rock and soil samples from the Moon continues to yield useful information about the early history of the Moon, the Earth, and the inner solar system. Recent computer models indicate that the Moon could have been formed from the debris resulting from the Earth being struck a glancing blow by a planetary body about the size of Mars. The chemical composition of the Moon, derived from studies of lunar rocks, is compatible with this theory of the origin of the Moon. We have learned that a crust formed on the Moon 4.4 billion years ago. This crust formation, the intense meteorite bombardment occurring afterward, and subsequent lava outpourings are recorded in the rocks. Radiation spewed out by the Sun since the formation of the Moon's crust, was trapped in the lunar soil as a permanent record of solar activity throughout this time.

Lunar Rocks and Soils from Apollo Missions

Comment by Mrs.B on August 13, 2018 at 4:04pm

Time will tell.

Comment by Stephen on August 13, 2018 at 4:01pm

Let's hope they are just showing extra precaution 

Comment by Mrs.B on August 13, 2018 at 3:55pm

Now of course the smoke is a factor too.

The alerts went up today so I guess we have to prepare just in case.

Comment by Stephen on August 13, 2018 at 3:52pm

Yeh it does seem that way sometimes 

Comment by Mrs.B on August 13, 2018 at 3:50pm

Every time something to look at comes around, its cloudy!

 
 
 

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