A closer look
If humans ever colonize Mars, the biggest threat may not be dust storms or cold—it may be radiation. Unlike Earth, Mars has no protective magnetic field to deflect high-energy cosmic rays. These rays can slice through DNA like invisible shrapnel, increasing cancer risks and neurological damage. Solutions being explored include using Martian soil itself as a shield: astronauts could build habitats buried in regolith, the planet’s loose gravel-like surface. Others propose growing thick water walls, since water absorbs radiation well. Interestingly, fungi found near Chernobyl’s reactor thrive under radiation by turning it into energy, raising the idea of ‘living shields’ in space. The future of humanity on another planet may hinge less on rockets and more on mastering biological armor.
