[Jack Hydrazine]

I was really looking forward to that 18 month slog to Pluto!

[Red Badger]

From Google:

1 N is the force of Earth's gravity on a mass of about 102 g = (1⁄9.81 kg). On Earth's surface, a mass of 1 kg exerts a force of approximately 9.81 N [down] (or 1.0 kilogram-force; 1 kgf = 9.80665 N by definition).

From the article:

the researchers observed apparent thrusts of ~20 micro-Newton

So we're not talking much 'force' of acceleration here.................