Galileo’s 58-Minute Descent Unveils Jupiter’s Hidden Atmosphere

Galileo’s 1995 Jupiter probe descended into the gas giant, transmitting for about 58 minutes before the harsh pressures ended the signal; it provided the first in-situ measurements of a giant planet’s atmosphere—temperatures, pressures, densities, chemistry, and cloud structure—revealing a drier-than-expected hot-spot region and hotter, denser conditions, while highlighting the limitation that a single descent cannot characterize the entire planet.