outermost

The two outermost moons, Ganymede and Callisto, are composed of about 50% water ice but likely contain rocky cores rich in elements such as carbon or silicon.

Unlike the water that falls from clouds on Earth, solar rain takes place in the Sun's corona, the outermost layer made of intensely hot plasma.

This region is essential for communication between brain networks but is also vulnerable to reduced blood flow from distal arteries, which carry blood from the heart to the outermost parts of the body.

BCC begins with abnormal growth of basal cells, which produce new skin cells when old ones die, on the outermost layer of the skin.

The outermost layer of the lava flow will almost immediately cool and form a crust, but the interior of the lava flow can remain molten for a time, Chadwick said.