'earth sphere' is correct and usable in written English.
You can use it to refer to the spherical shape of the Earth, or to the atmosphere of the Earth. For example, "The planet Earth is one of the few planets in the Solar System with an earth sphere."
The cover of the first issue was an image of the earth — another sphere — taken from space, exemplifying its spirit of holism.
The planet, called Kepler-186f, is the first Earth-size sphere outside our solar system with an orbit around its star that is in the "Goldilocks zone" — the habitable range that is neither too hot nor too cold.
The all-sky image is projected onto an Earth-centered sphere at a height of 250 km with the geomagnetic coordinate system shown in the background.
The all-sky image is projected onto an Earth-centered sphere at a height of 250 km, which is the typical altitude for a cusp aurora (e.g., Sandholt et al. 1990).
You understand the earth is a sphere and it's not a sphere because feudalism went down, it's a sphere, period!
Living on the moon will expand the sphere of human and robotic activity in space beyond low-Earth orbit.
(Hindu astronomers still taught that Earth was a sphere and that it rotated once daily).
Mosques have a niche in a wall showing the direction of Mecca(though the shortest route to Mecca is sometimes counterintuitive because the earth is a sphere -- northeast from New York and northwest from Honolulu, but consistent across a given city).
Huler writes with self-deprecating wit, and although some of his scientific discussions are excessively rudimentary ("The Earth is a sphere"), he captures the Beaufort scale's "open-hearted intellectual decency".
What we, his inheritors, got is something much better, and more useful: an indispensable guide (explanation, clarification, commentary, glossary, lexicon) to the mysteries (form, order, practice, functioning, performance) of a language now used more widely across the world (earth, planet, geosphere, sphere, home of man) than any other.
