Also contained in rocks once molten are radioactive elements whose isotopes provide Earth with an
atomic clock. Within these rocks, "parent" isotopes decay at a predictable rate to form "daughter"
isotopes. By determining the relative amounts of pa...
Boy howdy, this video definitely confirms that if you're going to gaze at our planet, the International Space Station is the best seat in the house. This video was shot during Expeditions 28 and 29 aboard the ISS from August-October of this year.