Moon may be shrinking, but very, very slowly
2010 08 20

By Randolf E. Schmid | MetroNews.ca



The moon may be shrinking but it will not be disappearing any time soon.

New research indicates cracks in the moon’s crust that have formed as the interior has cooled and shrunk over the last billion years or so. That means the surface has shrunk, too, though not so anyone would notice just from gazing at it.

Scientists have identified 14 landforms called lobate scarps scattered over the surface of the moon, explained Thomas R. Watters of the Center for Earth and Planetary Studies at the Smithsonian’s National Air and Space Museum.

Watters and colleagues describe their find in Friday’s edition of the journal Science.

The scarps had previously been noted at the moon’s equator, but this is the first evidence in other areas, indicating they result from a global process.

The study calls the scarps "evidence of recent thrust faulting on the moon." But this is planetary science, where "recent" can mean a billion years ago.

The scarps, or cliffs, extend across some small craters, and small craters tend to be obliterated over time, Watters explained in a telephone interview. In addition, there are no large craters imposed on top of the scarps, another indication they are relatively recent, in planetary terms, he said.

"One of the really cool parts of this ... the faults are so young-looking that you can’t escape the possibility that this contraction occurred recently, and could indicate that the moon is still active," Watters said.

The size of the scarps indicates a shrinkage in the size of the moon of about 100 metres (328 feet), which would not be nearly enough to be noticed with the naked eye. The moon is about one-fourth the size of the Earth in diameter.

The scarps range up to 10 metres (a little over 30 feet) high and a few kilometres long, he said. By comparison, the planet Mercury has much larger scarps indicating considerably more shrinkage over time.

The moon’s not going to disappear and its shrinkage will not affect the Earth in any way, Watters stressed.

Article from: MetroNews.ca



Related Articles
Moon’s Shell May Be Wet, But Inside Is Bone Dry
Subterranean Living May Await Moon And Mars Colonists
There’s a Monolith on Mars Moon, Phobos
Every nation received a moon rock — some of them can’t find it, (some of them were fake)
Japan sees Moonwalking Humanoids by 2015


Latest News from our Front Page

Seven Points of Agreement Between Individuals
2014 10 02
In what follows, underlined words are my modifications to the original (cite given at the end) "Seven Points of Agreement Between Individuals" -- a binding contract entered into by individuals with other individuals so as to create a society within which individual sovereignty is upheld. These agreements are thought by the author of the book within which they appear to ...
If Someone Secretly Controlled What You Say, Would Anyone Notice?
2014 10 01
The subject enters a room in which a 12-year-old boy is seated. A 20-minute conversation ensues. The subject quizzes the boy about current events and other topics to get a sense of his intelligence and personality. But the boy is not what he appears to be. Unbeknownst to the subject, the boy is wearing a radio receiver in his ear, and ...
Obama has had accurate intelligence about ISIS since BEFORE the 2012 election, says administration insider
2014 10 01
‘President Barack Obama’s intelligence briefings have provided him with specific information since before he won re-election in 2012 about the growing threat of the terror group now known alternatively as ISIS and ISIL, an administration insider told MailOnline on Monday. ‘Unless someone very senior has been shredding the president’s daily briefings and telling him that the dog ate them, highly accurate ...
Can holding a magnet against your head help defeat depression?
2014 10 01
Former GP Sue Mildred suffered from crippling depression and anxiety for 20 years. On two occasions it was so severe that she ended up in hospital, and for 15 years she was unable to work. Sue, 51, has tried antidepressants, talking therapies and, out of desperation, even ECT (electro-convulsive therapy), where an electric current is passed through the brain. This did ...
Extremists to have Facebook and Twitter vetted by anti-terror police
2014 09 30
Theresa May to announce new Extremist Disruption Orders to strengthen counter-terrorism if the Tories win the next general election Extremists will have to get posts on Facebook and Twitter approved in advance by the police under sweeping rules planned by the Conservatives. They will also be barred from speaking at public events if they represent a threat to “the functioning of democracy”, ...
More News »