WHAT A SPACE KINDLE COULD DO

Imagine a Cubesat with an e-ink panel that can toggle its pixels between black and white. White pixels, which reflect light, get a small amount of momentum when hit by sunlight. Black pixels, which absorb light, get some momentum, but less. Therefore, a panel split vertically between white and black gets greater force pushing its top (F1) than its bottom (F2), rotating it about its center of gravity (COG) and reorienting it in orbit – without using thrusters or fuel. Once it is reoriented (and farther from the sun) the panel could be turned black to absorb more heat and keep its instruments in their operable temperature range.