The phrase "a foreign planet" is correct and usable in written English.
It can be used when referring to a planet that is not from one's own country or is unfamiliar, often in the context of science fiction or astronomy.
Example: "The astronauts landed on a foreign planet, eager to explore its uncharted terrain."
Alternatives: "an alien planet" or "a distant planet".
A mission would involve the significant risk of launch, a landing on a foreign planet and a launch home again, plus the intense radiation throughout both legs of journey and the time on the Red Planet.
But the Earth and the moon are surprisingly similar at the chemical level, so we're still trying to figure out how a foreign planet from another part of space could have created it.
Recently, she told me, "I really believe that if we were from a foreign planet and we were sitting here and said, 'O.K., let's brainstorm on torture experiments,' the concept of sticking a needle into someone and sucking blood out slowly, while the person watches, probably qualifies".
His portrayal of London in particular is an enchanting evocation of the modern metropolis – the city is rendered as a psychedelic wonderland, as both an ocean and a mountain range, as both the depths of hell and the unexplored surface of a foreign planet.
This knowledge can then be propagated to the rest of the country where today Silicon Valley might as well be a foreign planet.
I come here and it's like I came to a foreign planet.
Too much American reporting from Iraq reads like the dispatches of a group of astronauts on a vicious foreign planet, leavened only by bland historical paragraphs about the Sunnis and the Shiites and their regrettable hatreds.
But the reason to read the book first is the character of 5-year-old Jack, who escapes the shed only to surface in an everyday world that feels, to him, like a bizarre foreign planet.
So when the Afghan-Canadian foot patrols left the NATO compounds, they suited up, materially and psychologically, almost as if they were about to visit a hostile foreign planet.
J.J. Abrams take note: we think these would look great on a strange and foreign planet in galaxy far, far away.
When he arrived in the USA, Roberto didn't speak one word of English; what a strange and foreign planet America must've seemed.
