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Today, Mars does not have a global magnetic field. However, Mars did power an early dynamo that produced a strong magnetic field 4 billion years ago, comparable to Earth's present surface field. After the early dynamo ceased, a weak late dynamo was reactivated (or persisted up to) ~3.8 billion years ago.
4 dni temu · The “when” question in particular has driven researchers in Harvard’s Paleomagnetics Lab in the Department of Earth and Planetary Sciences. A new paper in Nature Communications makes their most compelling case to date that Mars’ life-enabling magnetic field could have survived until about 3.9 billion years ago, compared with previous ...
12 paź 2023 · Without the magnetic field, the solar wind would strip our atmosphere, and the oceans would evaporate and be lost to space. In other words, Earth would end up like Mars. The Earth is the only one of the rocky planets in our Solar System to have a strong magnetic field.
19 cze 2023 · Mars’ magnetic field has been measured at large scale by orbiting spacecraft and at very small scale via Martian meteorites. Here we report on a ground magnetic survey on metre to kilometre...
20 gru 2022 · Now, fragments from a famous martian meteorite, studied with a new kind of quantum microscope, have yielded evidence that the planet’s field persisted until 3.9 billion years ago, hundreds of millions of years longer than many had thought.
11 lip 2023 · Previous evidence had suggested that Mars had lost its dynamo — and its accompanying strong, planet-encompassing magnetic fields — 4.1 billion years ago, Steele said. However, with the use of an innovative new quantum magnetic field microscope, the researchers were able to place the loss at 3.9 billion years ago or later.
Scientists have confirmed the existence of a planet-wide magnetic field at Mars using an instrument on-board NASA's Mars Global Surveyor orbiter, as the spacecraft began to circle and study the planet from a highly elliptical orbit.