be on another planet

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be (living) on another planet

  (informal)
if you say that someone is on another planet, you mean they do not notice what is happening around them and behave differently from other people He doesn't always make much sense. It's like he's on another planet half the time. (informal)
See also: another, on
References in classic literature ?
I am inclined to think that this blaze may have been the casting of the huge gun, in the vast pit sunk into their planet, from which their shots were fired at us.
If this planet has any atmosphere at all, it is one of no great density, and its orbit being without our own, we can easily trace on its surface the outlines of seas and continents.
Westward, where no planet should rise, the triple verticals of Trinity Bay (we keep still to the Southern route) make a low-lifting haze.
The George who strolled that pleasant morning on the Promenade des Strangers differed both externally and internally from the George who had fallen out with Harold Flower in the offices of the Planet Insurance Company.
I do not follow Matai Shang to kill him, though the God of mine own planet knows that my hands itch to be at his throat.
Eight zodes later he would set--a trifle over nineteen and a half Earth hours--and during that time Thuria, his vivacious mate, would have circled the planet twice and be more than half way around on her third trip.
Light from a planet is the reflected light of the sun.
Thus, then, advancing from atom to molecule, from molecule to nebulous mass, from that to principal star, from star to sun, from sun to planet, and hence to satellite, we have the whole series of transformations undergone by the heavenly bodies during the first days of the world.
he asked himself, gazing at the bright planet which had shifted its position up to the topmost twig of the birch-tree.
thou hast seen enough to split the planets and make an infidel of Abraham, and not one syllable is thine
Thereafter, I showed how the greatest part of the matter of this chaos must, in accordance with these laws, dispose and arrange itself in such a way as to present the appearance of heavens; how in the meantime some of its parts must compose an earth and some planets and comets, and others a sun and fixed stars.
It is for this reason that a quietism is to be found in Chinese poetry ill appealing to the unrest of our day, and as dissimilar to our ideals of existence as the life of the planets is to that of the dark bodies whirling aimlessly through space.
Mid planets her slaves, Herself in the Heavens, Her beam on the waves.
It may seem to be a matter of indifference whether we understand the meaning of historical events this way or that; yet there is the same difference between a man who says that the people of the West moved on the East because Napoleon wished it and a man who says that this happened because it had to happen, as there is between those who declared that the earth was stationary and that the planets moved round it and those who admitted that they did not know what upheld the earth, but knew there were laws directing its movement and that of the other planets.
1-17) Ares, exceeding in strength, chariot-rider, golden- helmed, doughty in heart, shield-bearer, Saviour of cities, harnessed in bronze, strong of arm, unwearying, mighty with the spear, O defence of Olympus, father of warlike Victory, ally of Themis, stern governor of the rebellious, leader of righteous men, sceptred King of manliness, who whirl your fiery sphere among the planets in their sevenfold courses through the aether wherein your blazing steeds ever bear you above the third firmament of heaven; hear me, helper of men, giver of dauntless youth