资讯

Earth's magnetic field originates in the outer core and extends out into the magnetosphere — a region of space that helps protect Earth from space weather.
“We find that both exhibit strong linearly increasing trends, coupled with a large surge in magnitude between 330 and 220 ...
Earth's magnetic field and oxygen levels have increased more or less in parallel over the past 540 million years, suggesting ...
Earth developed a magnetic field at least four billion years ago, the latest research shows — more than half a billion years earlier than thought. The work, described in the 31 July issue of ...
Learn about and revise magnets, magnetic poles, magnetic fields, permanent and induced magnets with GCSE Bitesize Combined Science.
Exposure to extremely low-frequency magnetic fields (ELF-MFs)--emitted by anything from power lines to appliances or improperly grounded wiring--is not likely to increase children's risk of ...
Magnetic blocks hold together, so kid-built structures don't easily collapse, while magnetic puzzles and play sets can be used in the backseat of the car without pieces falling this way and that.
Scientists may have solved the mystery of why the moon shows ancient signs of magnetism although it has no magnetic field today. An impact, such as from a large asteroid, could have generated a ...