When NASA’s Voyager spacecraft reached the heliopause—the outer edge of our solar system—they crossed into an extreme region often called the “wall of fire.” 50.000 Kelvin

 

When NASA’s Voyager spacecraft reached the heliopause—the outer edge of our solar system—they crossed into an extreme region often called the “wall of fire.” In this boundary zone, temperatures spike to tens of thousands of degrees as the Sun’s charged solar wind slams into the thin gas of interstellar space, superheating particles at the frontier of our cosmic neighborhood.

Despite those intense temperatures, the Voyager probes were never burned. The reason is density, not heat—there are so few particles in this region that almost no energy is transferred through collisions. It’s a powerful reminder that space can be unimaginably hot and yet harmless at the same time, revealing how different the universe truly is beyond Earth.

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