Clue: __ cloud: distant solar system region

Answer: OORT

Length: 4

---

Similar Clues:

• ___ cloud (solar-system region) (OORT with 4 letters)
• ___ cloud (distant part of the solar system) (OORT with 4 letters)
• __ cloud: solar system region beyond Pluto (OORT with 4 letters)
• Solar system's comet-intensive cloud (OORT with 4 letters)
• ___ cloud (solar system outlier) (OORT with 4 letters)
• _____ system (blood typing) (ABO with 3 letters)
• ____ system: blood-typing scheme (ABO with 3 letters)
• Visitor from beyond our solar system (ALIEN with 5 letters)
• Visitor from beyond the solar system (ALIEN with 5 letters)
• Closest star system to the solar system (ALPHACENTAURI with 13 letters)