"This space rock is a 4.5-billion-year-old time capsule. The Allende meteorite, which fell to Earth in 1969, holds secrets from the very beginning of our solar system. It contains "leftovers" from the formation of the planets—tiny grains that recorded the composition, pressure, and temperature of the solar system in its infancy. How do we read this ancient history? Join Denton Ebel, Curator of Earth and Planetary Sciences at the American Museum of Natural History, as he reveals the key: chemical