Research could shed light on which distant planets have the potential to host life.
, researchers have now looked at Earth's early magnetic field, just after the planet formed 4.5 billion years ago. Until fairly recently, it was thought the magnetic field had formed around 3.5 billion years ago. However, in 2015, researchers led by John Tarduno, Professor of Geophysics at the University of Rochester, found evidence to suggest it was at least 4.2 billion years old.
In their latest research, Tarduno and colleagues have been able to determine that the early magnetic field was stronger than previously believed. To do this they studied zircon crystals, which are some of the oldest materials on Earth.
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