However, one side reflective/white one absorbing black is possible. I guess the weight of extra paint is not attractive, compared to attitude control which yo

However, one side reflective/white one absorbing black is possible. I guess the weight of extra paint is not attractive, compared to attitude control which you need anyway. EDIT: this matters because full 180° reflection is like "bouncing" the photon to opposite velocity, can up to double exchanged momentum vs absorption. (This is why reflective mylar is nice)