NASA sends powerful radio transmissions into space. Who's listening, and when will they respond?
The DSN can receive signals if it’s pointed in the right direction.The DSN signals don’t magically stop at the spacecraft they’re targeting: They continue into interstellar space where they eventually reach other stars. But electromagnetic waves like radio transmissions and light can only travel so fast—that’s why we use light-years to measure distances across the universe.
around 27 light-years away in 2002. The study team estimates a return message from any alien life near this dead star could reach us as soon as 2029, but no earlier.More opportunities for return messages will pop up in the next decade. Signals sent to Voyager 2 around 1980 and 1983 reached two stars in 2007: one that’s 26 light-years away and athat’s 24 light-years away, respectively. If aliens sent a message right back from either, it could reach Earth in the early 2030s.
Derrick and Isaacson propose that radio astronomers could use their star lists to listen for return messages at predetermined times. For example, in 2029 they may want to point some of Earth’s major radio telescopes towards the white dwarf that received Pioneer 10’s message. , an astronomer at Penn State not involved in the new study. These factors include “how long or often we monitor the star for a response, and how long or often the return signal is transmitted.”There are still many unknowns when considering alien life. In particular, astronomers aren’t certain the stars in this study even have planets—although based on other exoplanet studies, it’s likely that at least a fraction of them do.
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