Outermost

One night in 1572, Danish astronomer Tycho Brahe saw what he thought was a brilliant new star in the constellation Cassiopeia. (We now know he was observing a supernova.) In 1604, a second supernova was observed. These discoveries caused scientists to seriously question Ptolemy's theory that all stars were contained in an outermost sphere of the universe that never changed.

The exosphere is the outermost layer of our atmosphere.

Callisto, the outermost of the four Galilean moons, has an old surface that is perhaps the most heavily cratered of any object in the solar system.

The Sun's corona is the outermost part of the Sun's atmosphere.

Pluto was called a planet from 1930 to 2006, when it was demoted because there appeared to be other bodies similar to Pluto orbiting beyond it, making Neptune the outermost planet.

He lived on the outermost edge of the city.

Observe, the Analytical course is from outermosts to innermosts, from effects to causes […]