红色细长的丝状体是由冷却下来的气体组成，气体处于磁场中。
The red threadlike filaments are composed of cool gas suspended by a magnetic field.
岩浆冷却并凝固下来后，地磁场的方向和磁极被保留在磁化了的火山岩中。
When the magma cools and solidifies, the direction and the polarity of the field are preserved in the magnetized volcanic rock.
一些人说，因为看起来该行星在它形成的早期已经迅速冷却，它的核心已经固化，磁场只是留在岩石中的剩余部分。
Some say because the planet appears to have cooled rapidly early in its history, its core has solidified and any magnetic field is a remnant captured in rocks.
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