This Stunning Timelapse Space Video Will Astonish You

Technical question: is it possible to do low-light time-lapse filming that produces realistic "motion blur"?

At the beginning, there are a lot of shots where lights occupy long lines, as the earth turned during the exposure. Then jump to next frame, and the line has abruptly jumped forwards. Which is what must happen with sequential frames in low-light. So the total effect looks jerky.

Now let's suppose these were 30-second exposures. What if the camera instead took 30 1-second exposures, each of which were severely underexposed. But then software would add frames 1-30 to generate a well-exposed "final frame 1", then frames 2-31 to generate "final frame 2", frames 3-32 to generate "final frame 3", and so on. Each final frame would have full exposure, but the final output would be beautifully smooth, with "natural"-feeling motion blur.

This probably requires on-the-fly computation far beyond any kind of consumer camera. But does anyone know of software that does this? It would be fairly straightforward to write.