Fig. 6From: Miniature lightweight X-ray optics (MiXO) for surface elemental composition mapping of asteroids and cometsAdvances of X-ray optics. a A ground and polished glass substrate, b electroformed Ni shell, c thin electroformed NiCo shell, and d a metal-ceramic hybrid shell. The weights (asterisk) are for a 70 cm dia., 60-cm-long mirror shell. For small mirrors (\(\sim\)5 cm dia.) suitable for planetary science, a single shell would weigh \(\sim\)10 g or lessBack to article page