so this didamos binary asteroid, ditamos and bimorphous, if you re into happy naming, is an asteroid where you have an asteroid that has a wide center like this double strawberry and then you have another asteroid going around it like the blueberry. so if you can hit the blueberry with a spacecraft, like these strawberry leaves, then you can slow this smaller asteroid down ever so slightly, ever so slightly, and then when an object is closer to the when a smaller object is closer to the larger object, it will go around faster. that s why, for example, mercury goes around the sun much faster than our earth does. and so we ll be able to detect this tiny change in the period of the smaller asteroid.