Time Machine
You have arrived · The Moon Race
Luna 16
first robotic sample return from another world
September 24, 1970Lavochkin
NASA / NSSDCA archive (Soviet Lavochkin design)
The world that day
3.6 billion
People on Earth
2
Nations to launch a human
4
Humans to walk on the Moon
0
Known worlds beyond the Sun
When Luna 16 dropped toward Mare Fecunditatis on 20 September 1970, the Sun had already set on its landing site. The spacecraft descended through the lunar night and settled onto the basalt plain in darkness, with no astronaut aboard and no audience, a machine working alone on the night side of the terminator. Moscow had been chasing this feat for years; Luna 15 had crashed attempting it fourteen months earlier, even as Apollo 11's astronauts were still working on the surface.
On command from Earth, a drill at the end of an articulated arm bored into the regolith, stopping 35 centimetres down, and the arm swung the core up in an arc to deposit it inside a small sealed sphere atop the ascent stage. The entire visit lasted 26 hours and 25 minutes. At 07:43 UT on 21 September the upper stage fired straight up off the back of the lander, leaving the descent stage as a permanent launch pad on the Moon, and carried its 101 grams of cargo onto a path for home.
Three days later, on 24 September 1970, the capsule made a ballistic plunge into Earth's atmosphere and parachuted down about 80 kilometres southeast of Dzhezkazgan in Kazakhstan, carrying the first pieces of another world ever fetched home by a machine. The Soviet program had its answer to Apollo: a robot could sample the Moon without risking a single life. Decades on, three tiny grains from those 101 grams became the only documented Moon samples ever legally sold privately, fetching 855,000 dollars at Sotheby's in 2018.
By the numbers
- Launch
- 12 Sep 1970, Baikonur
- Lunar landing
- 20 Sep 1970, Mare Fecunditatis (0.7° S, 56.3° E)
- Sample
- 101 g from a 35 cm drill core
- Surface stay
- 26 h 25 min
- Ascent liftoff
- 21 Sep 1970, 07:43 UT
- Earth return
- 24 Sep 1970, near Dzhezkazgan, Kazakhstan
Why it mattered
Luna 16 founded the entire discipline of robotic sample return. Its direct successors Luna 20 and Luna 24 brought back more of the Moon, and its conceptual heirs, Hayabusa at an asteroid, OSIRIS-REx at Bennu, and Chang'e 5 and 6 on the Moon, all trace to the proof it delivered: that automation could do what once seemed to require a crew, at a fraction of the cost and risk. It gave laboratories on Earth their first extraterrestrial material gathered without human hands.
- The landing and the entire drilling operation took place in darkness; the Sun had already set over Mare Fecunditatis before Luna 16 touched down.
- The drill stopped at 35 centimetres, and the arm swung the core up in an arc to seal it inside a small sphere on top of the return rocket.
- Luna 16 succeeded fourteen months after its predecessor Luna 15 crashed into the Moon while Apollo 11's crew was still on the surface.
- Three tiny Luna 16 grains are the only documented lunar samples ever legally sold privately: 442,500 dollars at Sotheby's in 1993, then 855,000 dollars when resold in November 2018.
- The descent stage stayed behind as a launch pad; the ascent stage carried the sample straight back to a parachute landing in Kazakhstan with no orbital rendezvous at all.
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