It is commonly known that the Earth has a magnetic field of its own. This protects our ozone layer not only by repelling solar winds but also drives major worldwide navigation systems.
A traditional compass that tells you the way on Earth will not help on the Moon, now without a global magnetic field. But now scientists believe that a lunar magnetic field existed a billion years ago and was probably stronger than the Earth today.
This was determined by researchers from the Massachusetts Institute of Technology (MIT) in Cambridge, USA, through a study of the moon samples brought back from NASA’s Apollo mission.
In a press release, MIT has measured microteslas in order to determine changes in the magnetic field against today’s 50 microteslas magnetism. The rock samples, measuring around 100 microteslas four billion years ago, indicate that the lunar magnetic field is twice as strong as the Earth.
Then how did Moon lose the shield? Scientists theorize that the Moon was four billion years ago a lot closer to the Earth and that the earth’s gravity helped the moon retain its magnetic field.
As earth gravity worked on the lunar, shaking its iron core, it created a powerful magnetic field, which we call the electric dynamo. These are the motions on Earth that make the volcanoes erupt; the same movements that made the magnetism of the Moon stronger for a short while until it began to move away from the Earth and was alone.
Without the Earth’s gravity to lift the iron inside, around 2.5 billion years ago the lunar core began to crystallize. Once the magnetic field had been completely weakened, the Moon was defenseless to the rough whips of the Sun. It was the death of the powerful lunar dynamo.
Fortunately, the Earth still has its own magnetic field, but lately, it has undergone some transformations. The magnetic north pole of our planet seems to drift more rapidly than ever and is bound for Siberia.