[CatOwner]

As the Sun’s warmth moved further into the solar system, what happens with Mars? Has its fate already been decided, or can it change to something closer to Earth’s?

[Paul R.]

Mars does not have a global magnetic field, which is quite problematic.

[EandH Dad]

Neither Mars nor Venus has an intrinsic magnetic field to block the solar wind. The solar wind eventually strips away the atmosphere and things go south from there.