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3 September 2019
Mercury’s ancient magnetic poles were far from the location of its poles today, implying its magnetic field, like Earth’s, changed over time, a new study says.
6 September 2018
The mystery behind lunar swirls, one of the solar system’s most beautiful optical anomalies, may finally be solved thanks to a joint Rutgers University and University of California Berkeley study. The solution hints at the dynamism of the moon’s ancient past as a place with volcanic activity and an internally generated magnetic field. It also challenges our picture of the moon’s existing geology.
17 December 2014
The asteroid that smashed into the Yucatan Peninsula a little more than 66 million years ago left behind the Chicxulub crater, but it also left behind something else: iridium, a rare element, which settled in a fine layer all over the world. When scientists discovered this layer between rock strata in the 1980s, it eventually led them to the crater as well, and an explanation for the disappearance of the dinosaurs. But on either side of that layer, which serves as a geological boundary between the Cretaceous and the Paleogene, determining the age of rock is more difficult. This fuzziness makes it harder for paleontologists to piece together the timeline of life’s evolution after the mass extinction, which included the emergence of humans and all other mammals.
13 December 2013
Cassette tapes or eight-tracks might be the first things that come to mind when thinking about dated magnetic storage, but Bronze Age clay pottery has them both beat. Using information stored in the clay’s magnetic minerals, scientists are developing methods to determine how old these artifacts are when other dating methods come up short.