The moon lost its magnetic fields one billion years ago: Study

MIT scientists have determined when the moon's Dynamo stopped, leading to the dissipation of its magnetic field. Using lunar rocks collected by the Apollo mission, they found that most rocks were too old to study the end of the Dynamo. However, two samples from 1 billion years ago showed a weak magnetic field, suggesting the moon's gravitational effects were waning. The moon was once closer to Earth, causing its liquid core to wobble and create a magnetic field. The findings indicate that these gravitational effects began to diminish 1 billion years ago.

What was the primary function of the lunar Dynamo?

• To create a strong global magnetic field

• To increase the moon's gravitational pull

• To regulate the moon's temperature

• To control the moon's orbit around Earth

Why is it challenging to study the end of the moon's internal Dynamo using most lunar rocks?

• They are too fragile

• They are too small

• They are too old

• They are too young

What method did scientists use to ensure the accuracy of the magnetic records in the lunar rocks?

• Freezing the rocks

• Crushing the rocks

• Reheating the rocks

• Cooling the rocks

What caused the liquid lunar core to wobble, creating the magnetic field?

• The gravitational effect from Earth

• The sun's radiation

• The impact of meteorites

• The moon's rotation

What does the weak magnetism recorded by the two rocks suggest?

• The moon's surface is cooling rapidly

• The moon is moving closer to Earth

• The gravitational effects had begun to seize up

• The moon's core is solidifying