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Related to Planets: solar system, List of planets

be (living) on another planet

slang To be oblivious to one's surroundings or act strangely. I have no idea what the professor said during today's lecture because I was on another planet the whole time. The millionaire investor always says something wacky in the board meetings—it's like he's on living another planet.
See also: another, on, planet

What planet is (someone) on?

What are you thinking? That is an absurd or stupid thing to think or do. (Implies that someone would only do or think that if they were an alien from another planet.) A: "I think they should just do away with taxes altogether!" B: "What planet are you on? Taxes pay for hospitals, roads, our military—literally everything on which our society is built." What planet is he on? He could get someone killed driving that speed along a residential road!
See also: planet, what

what planet is someone on?

COMMON You can say what planet is someone on? to show that you think someone has crazy ideas or does not know about something that most people know about. What planet are these people on? Do they not read their own headlines? Note: This expression is often varied. For example, you can ask what planet does someone live on? or what planet does someone come from?. He thinks hospitals can make major cuts to their budgets. What planet does he live on? Note: You can also say that someone is on another planet. She was just on another planet, I think. She didn't seem to understand that we are ordinary people.
See also: planet, someone, what

what planet are you on?

used to indicate that someone is out of touch with reality. British informal
See also: planet, what

be on another ˈplanet


what ˈplanet is somebody on?

(spoken, humorous) used to suggest that somebody’s ideas are not realistic or practical: He can’t really think we’re going to finish the job today, can he? What planet is he on?
See also: another, on, planet
References in periodicals archive ?
Over the past few years, astronomers have found several extra-solar objects that by weight would qualify as planets, yet they lack what would seem to be the most basic of planetary prerequisites--a parent star.
Which planet has an average temperature of approximately -140[degrees]C?
It's one of about 200 extrasolar planets that astronomers have discovered so far.
HISTORY: When Galileo first scanned the skies with a telescope in the early 17th century, his observations altered human understandings of the planets.
The aliens will talk chineese and they will be nice to the people they will live on their planet but sometimes they will go to other planets.
To ancient observers, planets were considered wandering stars because they appeared to rise and set in an otherwise fixed sky.
But this means that other bodies in the solar system would also qualify to be called planets.
The spheres' gravity pulled in more gas and dust to form the planets (5).
Now the count of alien planets is up to 10 - surpassing the nine in our own back yard - and rising fast.
Many other extrasolar planets lie even closer to their stars, but they aren't nearly as puffy.
The discovery around the small red star Lalande 21185 follows recent findings of planets around three sunlike stars in the greatest rush of new worlds since Columbus stumbled upon the Western Hemisphere.
The solar system has 12 planets instead of the familiar 9, according to a proposal that the General Assembly of the International Astronomical Union (IAU) will vote on next week in Prague, Czech Republic.
Exultant astronomers learned last week of the discovery of two planets with characteristics similar to Earth's - a revelation that greatly increases the probability that life exists elsewhere in the universe.
The raw material for planets comes from disks of gas, dust, and ice particles that form around young stars.
In a stunning discovery of new worlds far out in the universe, two California astronomers on Wednesday reported the detection of two planets orbiting sun-like stars.