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 ...

Earth's crust ranges from 5 to 70 kilometers in thickness and serves as the planet's outermost layer. This thin shell represents less than one percent of Earth's total mass, yet it's the only layer we ...