Crossword Clue: Red Planet
Here's the answer to the Red Planet crossword clue, with an explanation and where it has appeared.
Definition & answer: MARS
The answer to "Red Planet" is MARS. Mars is a 4-letter word made up of 1 vowel and 3 consonants, beginning with M and ending with S. In a crossword grid it occupies a 4-square slot, and each of its letters also forms part of a word crossing it — so even if the clue stumps you, the crossing entries will usually hand you enough letters to fill it in.
Origin & meaning
Mars is named for the Roman god of war, a nod to its blood-red hue caused by iron oxide dust. As a four-letter answer it does triple duty in puzzles, cluing the planet, the deity, or the candy company.
Common usage
Mars turns up frequently in crosswords precisely because of that letter mix. Short, vowel-friendly words like MARS are a constructor's best friend: they interlock cleanly with longer entries and help a grid come together without awkward letter clashes. When you see a 4-letter slot and already have a crossing letter or two, MARS is often quick to confirm — especially once the M or S is in place.
Crossword trivia
Because it is only 4 letters long, MARS appears far more often in daily mini and themed puzzles than longer, more obscure words. Regular solvers come to recognize it on sight, and it is exactly the kind of entry worth committing to memory: the more common short words you know cold, the faster your solve times become.
Stuck on this clue?
If "Red Planet" has you stuck, don't force it — jump to the clues crossing this slot instead. Filling in even one or two intersecting letters usually makes MARS obvious. That crossing-first approach is the single most useful habit for improving at crosswords, and it works on everything from the quick daily Mini to a full Sunday grid.
This clue in different puzzles
Setters vary how they clue MARS — sometimes with a straight dictionary definition, sometimes with wordplay, a pun, or a fill-in-the-blank — but the answer itself stays the same. Learning to spot the answer behind the disguise is a core crossword skill.
Example sentences
- "I had the crossing letters, so writing MARS into the grid took no time at all."
- "Mars is the kind of answer that clicks the moment you spot one letter."
- "Seeing 'Red Planet' in the clue list, an experienced solver pencils in MARS almost immediately."
- "Once the M was confirmed by the crossing word, MARS was the only entry that fit."