Mystery of Moon’s Magnetic Field Deepens
By Charles Q. Choi | SPACE
The moon generated a surprisingly intense magnetic field until at least 3.56 billion years ago, 160 million years longer than previously thought, a new study reports.
These findings could shed light not just on the magnetic field of the moon, which is now extremely weak, but on that of asteroids and other distant worlds, investigators added.
Earth’s magnetic field is created by its internal dynamo, which itself is generated by the planet’s churning molten metal core. Research increasingly suggests that the moon once had a dynamo as well, with evidence of magnetism found in lunar rocks returned by Apollo astronauts.
Models of the moon’s core suggest its dynamo should have lasted only until about 4.1 billion years ago. However, last year, scientists revealed that the moon possessed a magnetic field for much longer than previously thought, with a powerful dynamo in its core from 4.2 billion years ago to at least 3.72 billion years ago.
Researchers have proposed two possibilities to explain why the moon’s dynamo lasted so long. One possible explanation is that giant cosmic impacts set the moon lurching enough to drive its dynamo. Another explanation has to do with how the moon’s core spins around a slightly different axis than its surrounding mantle layer, generating wobbles — known as precession — that could dramatically stir its core.
The cosmic-impact idea is supported by the fact that the moon experienced massive collisions until around 3.7 billion years ago, such as the one that created the 715-mile-wide (1,150 kilometers) Mare Imbrium, among other craters.
However, the dynamo generated by each impact would have lasted for a mere 10,000 years or so, scientists say. In contrast, if precession drove a lunar dynamo, the moon could have continuously possessed a magnetic field until as late as 1.8 billion years ago.
Now, a new analysis of the biggest lunar rock brought back to Earth by Apollo 11 astronauts in 1969 reveals the moon’s dynamo lasted about 160 million years longer than previously thought, well after the last of the largest crater-forming impacts hit the moon.
Read the full article at: space.com
Big Bang: Biggest meteorite explosion rocks the Moon
Do We Really Need the Moon? - BBC Documentary
Water on Earth and Moon May Have Same Source
What If We Lost Our Moon?
Latest News from our Front Page
Facebook completes first drone flight above UK, Mark Zuckerberg confirms
Solar powered drones which provide internet access to rural and remote areas have been trialled in UK for first time by Facebook.
They â€śhave a wingspan greater than a Boeing 737 but will weigh less than a carâ€ť, according to the social network's chief Mark Zuckerberg.
The drones, developed by Somerset-based company Ascenta which Facebook bought last March, will beam down laser-guided ...
300 Young English Girls (and a few Boys) Groomed and Assaulted by Oxfordshire "Gangs," Report Finds
Editor's note: This story is a few days old now but the echoes of Rotherham just keeps coming. A few weeks ago there was Halifax, now Britain proudly can add Oxfordshire to their line up of diversity success stories.
Below is the story from the telegraph:
Serious case review finds failings by police and social services as it identifies hundreds of victims
British POW describes the horror of the bombing of Dresden
Partial Transcript of Interview with Victor Gregg, WW2 British solder and POW:
Interviewer: "Tell us how it was that you were in Dresden at that time."
Victor Gregg: "It was evil....thousands of firebombs dropping all over the place, heat, fire, people screaming, people burning, people alight. After about half an hour it started developing into something that was really bad....It was ...
Rape of 285,000 German Women at the End of WWII Trigger Damage Control by Mainstream Media
Is Exposing Allied War Crimes an honorable act? No, itâ€™s slandering heroes according to Daily Mail
A recent article from the Daily Mail that pretends to look at the post WWII crimes and rapes of the Allies against the German people is actually damage control. Itâ€™s really an attempt to divert away from the true horrors that was visited upon Germany ...
Minister of Migration attacked by asylum seeker with fire extinguisher
Swedenâ€™s Minister of Justice & Migration also known as Morgan â€śonly 1%â€ť Johansson, has been attacked with a fire extinguisher when he visited an asylum home for future Swedes.
Regional newspaper, Kristiandstadsbladet reported that a man who had been living at the home for a couple of weeks grabbed a fire extinguisher and sprayed foam all over the minister who didnâ€™t ...
|More News » |