NASA's Galileo spacecraft did a fly-by of Jupiter's second largest moon in 1996 and 1997 and found that Callisto's magnetic field varied, indicating currents.

NASA的伽利略号太空船在1996年和1997年低空飞越这颗木星的第二大卫星，他们发现木卫四的磁场在不断变化，这意味着存在电流。

youdao

The dealer had come prepared to help Hebborn discover the desired image, showing him photographs of more easily visible van de Velde paintings, pointing out the sort of ship he expected to be found, and indicating anticipated details from rigging to sea currents.

FORBES: The Case Of The Art Forger Who Restored Dead Painters' Careers [Book Excerpt]