Out of every planet in our solar system, Mars is most comparable to Earth (via NASA Science). Imagery from Perseverance and other space rovers exposes the red planet's valleys, mountains, and peaks, as well as its canyons, ice caps, and seasonal changes. Based on our current knowledge of the planet, it's a place that was likely once bursting with life.
Initial evidence of a Martian magnetic field has been stored in space rocks. According to Universe Today, experts speculate that Mars lost its magnetic field about 3.7 billion years ago. This theory springs from evidence newly collected by MAVEN data via examination of the Lucus Planum lava flow. And it is largely believed that losing this magnetic field is what ultimately murdered the now red planet through a process that slowly stripped away at its atmosphere. Scientists have even discovered what appears to be a hole in the magnetic field signal on Mars. Of course, that is Mars. But what about Earth?
Live Science reports that as of 2020, NASA scientists have been scrambling to deal with a slow-moving dent in our planet's magnetic field positioned over the South Atlantic Ocean. Like most things that threaten our very existence, this dent is quiet, invisible, and not easily detected.
