Why doesn’t the Moon have a magnetic field?
18 August 2022
Why doesn’t the Moon have a magnetic domain?
Chris Smith answered.
Chris – That is a very good question. It has to do with where the Moon came from.
Neil Armstrong, who I mentioned earlier, stayed on the Moon, and scientists brought back a piece of the Moon’s surface, so we know what the Moon is composed of.
Where did the Moon come from? Scientists have pieced together a theoretical model of how the Moon was created. The Moon is relatively large compared to Earth. It is much larger than the other moons. Scientists believe that Earth and a second planet called Thea had an interplanetary collision around Earth’s birth, when the solar system was very young, about 4.5 billion years ago.
Something similar to the RTA happened on the planets. The two planets collided with each other, and a catastrophic collision occurred, so much debris from the crust of these planets was ejected like a cocoon around the Earth and this planet, and the cores of these two planets merged.
The result was a large planet with a very dense iron core and a cocoon-like “crust” of material that slowly sank and became the Moon, just as the planets first formed, and the remnants of the planet assembled in orbit around the then Earth.
If Earth didn’t have a magnetic field, it would be a dried-up prune of a planet, just like Mars.
Dave – Also, the Moon is much smaller than Earth, so it loses heat much faster. It doesn’t have the molten metal core needed to create a strong magnetic field as Earth does.
The Earth’s core contains a lot of iron. We believe that this iron core is a necessary element for creating the magnetic field. However, because the Moon is small, cold, and made up primarily of crust, it has no iron core and rotates in a liquid to create the magnetic dynamo effect.