Walls of fire
Grok: The hottest part of Earth’s atmosphere is the thermosphere, where temperatures can soar to 4,500°F (2,500°C) due to intense solar radiation absorption. Located 50–400 miles above the surface, this layer hosts auroras and satellites. Despite the extreme heat, the sparse air molecules mean it wouldn’t feel hot to the touch. This dynamic region marks the edge of space, interacting with solar winds and cosmic rays.
In 1977, NASA sent Voyagers 1 and 2 to probe the outer Solar System. Almost 50 years on, they’ve encountered a “wall of fire” — a scorching plasma zone (54,000–90,000°F) at the heliopause, where the Sun’s reach fades. Detected by both probes years apart, this enduring feature is transforming our view of the Solar System’s edge and its link to the galaxy.
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