NASA is listening for any peep from Voyager 2 after losing contact with the spacecraft billions of miles away.

A probe launched by NASA four days after Elvis died has delivered a treasure trove of data from beyond the “solar bubble” that envelops Earth and our neighboring planets, scientists reported Monday.

NASA's Voyager 2 probe has left the protective bubble around the Sun and is flying through interstellar space, becoming the second human-made object to travel so far, the US space agency says.