Giant antennas hear whispers from deep space
Earth's massive deep space antennas capture ultra-faint signals from spacecraft billions of miles away, enabling us to explore the cosmos and understand our universe.
Massive deep space antennas form a global network, essential for tracking and communicating with distant spacecraft. NASA's Deep Space Network, established in the 1950s, uses three key sites in California, Spain, and Australia to maintain continuous contact as Earth rotates. These huge dishes, some 70 meters wide, can detect incredibly faint radio signals, often weaker than a refrigerator light bulb seen millions of miles away. For example, signals from Voyager 1, over 14 billion miles out, take 22 hours to reach us. This network has supported iconic missions like the Mars rovers and the James Webb Space Telescope, pushing the boundaries of human exploration without physical presence.