Clue: Space-probe org.

Answer: NASA

Length: 4

---

Similar Clues:

• Unmanned space probe launched Aug. 20, 1977 (VOYAGERII with 9 letters)
• U.S. space probe (MARINER with 7 letters)
• Outer space probers, briefly (SETI with 4 letters)
• 2015 destination of the Dawn space probe (CERES with 5 letters)
• NASA space probe (MARINER with 7 letters)
• Early Soviet space probe (e.g. LUNA with 4 letters)
• Soviet space probe (LUNA with 4 letters)
• Type of space probe (LANDER with 6 letters)
• Items on space probes (SENSORS with 7 letters)
• Space-probe target (MARS with 4 letters)