Lunar dynamo's lifetime extended by at least 1 billion years
Wednesday, August 9, 2017 - 15:02
in Astronomy & Space
Astronomers report that a lunar rock collected by NASA's Apollo 15 mission exhibits signs that it formed 1 to 2.5 billion years ago in the presence of a relatively weak magnetic field of about 5 microtesla. That's around 10 times weaker than Earth's current magnetic field but still 1,000 times larger than fields in interplanetary space today.