The lander is in the comet's frame of reference. To it, the comet is stationary, and the universe is whipping around them. The same way you perceive yourself t

The lander is in the comet's frame of reference. To it, the comet is stationary, and the universe is whipping around them. The same way you perceive yourself to be stationary on the earth, despite earth orbiting the sun at 67 thousand miles an hour.