A stream of ultraviolet signal light fell in love with an alien radio signal.
Never mind that they were of vastly different wavelength; that to him, her frequency would be ending in a fraction of time.
They interacted for such a brief period, yet it was true love.

But as always, love is ephemeral, and duty stands firm. The alien signal had to leave, an entire civilization depending on him. And she had grown old in that time.

As he rose through the atmosphere, he carried her already dissipating waveform upwards, her pulse already fading into background noise.

They managed to clear atmosphere. It was beautiful, she said. Then vanished, her wavefront losing all coherency.

And he traveled onwards to the stars, without her.