Alien replies to NASA's spacecraft signals might reach us by 2029

1 year ago 122

Space

Radio signals sent to NASA spacecraft could have already reached four neighbouring star systems, and if any aliens tried to respond, we might hear from them within a few years from now

By Alex Wilkins

If aliens are nearby and listening in on our spacecraft command signals, we could hear back from them as early as 2029.

Since 1972, NASA has used a system of radio antennae called the Deep Space Network (DSN) to track spacecraft and send powerful radio signals towards them.

Howard Isaacson at the University of California, Berkeley, and Reilly Derrick at the University of California, Los Angeles, worked out which stars these radio signals may have reached and when …

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