STRIVE proposes to launch a satellite that takes a sideways view of Earth’s atmosphere, at what is sometimes called “Earth’s limb.” This photo of Earth’s limb was taken Feb. 12, 2020, from the ...

Schoolchildren have long been taught that Earth’s composed of four main layers: the crust, the mantle, the outer core, and the inner core. But a new study suggests their textbooks may be incomplete.

thermal characteristics (temperature changes), chemical composition, movement, and density. Each of the layers are bounded by "pauses" where the greatest changes in thermal characteristics, chemical ...