The most common and most likely answer to this crossword clue is the 6 letter word COMETS which also is the latest solution we found used in Washington Post in 2003.
Oort cloud's composition crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| COMETS | 100 % | 6 | 
Words with a meaning similar to the clue: Oort cloud's composition
These words may or may not be a possible solution to this crosswords clue.- comet
 - altostratus
 - break
 - cirrocumulus cloud
 - clouded
 - cloudscape
 - cloudy
 - cumulus
 - draw
 - gather
 - gathered
 - mamma
 
Crossword Answer definitions
COMETS noun- A celestial body consisting mainly of ice, dust and gas in a (usually very eccentric) orbit around the Sun and having a "tail" of matter blown back from it by the solar wind as it approaches the Sun.
 - A celestial phenomenon with the appearance given by the orbiting celestial body.
 - Any of several species of hummingbird found in the Andes.
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution