The image, that was captured by the Very Long Baseline Array (VLBA) on Feb. 21, was released to celebrate Voyager 1 entering the interstellar medium.
According to NASA, the signal being generated by Voyager 1 is very weak. The spacecraft's main radio transmitter generates just 22 watts - the approximate radiated power of a refrigerator light bulb.
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But to a huge radio array like the VLBA, Voyager 1′s signal is easily detectable as a faint radio glimmer in the darkness of the interstellar ocean.
"They were able to see a blue speck," Suzanne Dodd, Voyager's project manager at NASA's Jet Propulsion Laboratory, Pasadena, Calif., said during a news conference Thursday. "And this image represents the Voyager radio signal as seen by the world's most sensitive ground-based telescope. It's just a speck in amongst a sea of darkness."
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It is estimated that Voyager 1′s dwindling power supply - generated by three radioisotope thermoelectric generators (RTGs) - will only allow for the spacecraft's science instruments to be powered up until 2020 and then by 2030, the mission will go silent and Voyager 1′s faint radio glimmer will be extinguished for good.