How many letters does the top answer for “wrote life on mars?” have?

The most common answer is bowie (5 letters).

Crossword clue: wrote life on mars?

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

bowie 5 letters wd-fact-v3

United States pioneer and hero of the Texas revolt against Mexico; he shared command of the garrison that resisted the M

author of life on mars? 50% similar → bowie

composer of life on mars? 50% similar → bowie

wrote a little life 50% similar → yanagihara

wrote life is a dream 50% similar → barca

wrote life is elsewhere 50% similar → kundera

wrote life of galileo 50% similar → brecht

wrote life of pi 50% similar → martel

wrote life stinks 50% similar → brooks