NASA on Monday will broadcast the Beatles' song "Across the Universe" across the galaxy to Polaris, the North Star.

"Send my love to the aliens," Paul McCartney told NASA through a Beatles historian. "All the best, Paul."

The song, written by McCartney and John Lennon, may have a ticket to ride and will be flying at the speed of light. But it will take 431 years along a long and winding road to reach its final destination. That's because Polaris is 2.5 quadrillion miles away.

NASA loaded an MP3 of the song, just under four minutes in its original version, and will transmit it digitally at 7 p.m. EST Monday from its giant antenna in Madrid, Spain. But if you wanted to hear it on Polaris, you would need an antenna and a receiver to convert it back to music, the same way people receive satellite television.