The second spacecraft met the same searing frontier.

When Voyager 2 reached the farthest edge of the Sun’s influence, it passed through a region unlike any other in the solar system. Instruments recorded an unexpected spike in heat, density, and magnetism, marking its journey into interstellar space. The spacecraft had entered what scientists call a “fiery barrier,” a turbulent boundary where the solar wind collides with the charged gas between stars. The temperatures there rose into the tens of thousands of kelvin, but the plasma was so thin that the spacecraft never felt the heat. It glided through, silent and unharmed.



