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answers:
Sammy say: Bags full of poop.
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mars say: Bacteria from Earth.
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nineteenthly say: Laser reflectors, a plaque commemorating the first visit, the lunar rovers and the bases of the LEMs.
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Newdivide1701 say: The lower part of the Lander, lunar rovers, all sorts off stuff that Hubble cannot detect.
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Bill say: The lower half of the LEM. tools and in the later flights the Rovers.
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Brigalow Bloke say: Golf ball, two seater electric car, retroreflectors, lunar descent modules, a family photograph, TV cameras and transmitters, that's about all I can think of just now.
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Clive say: Obviously the 6 bottom halves of the Lunar Modules that actually landed - the design was that only the top half took off again, leaving the bottom half behind as a launch pad. And 3 top halves intentionally crashed on the Moon (see later for why). Plus 3 Moon buggies from Apollos 15, 16 and 17. That's the big stuff.
And famously, a couple of golf balls hit across the Moon by Alan Shepard. And various other detritus, including a number of Hasselblad cameras, which makes Hasselblad the only camera company to have products on another celestial body.
And a lot of scientific instruments. This is where we come to the reason for crashing some of the Lunar Modules on the Moon - these instruments include seismometers. We use them on Earth to detect and measure earthquakes. Obviously it would be interesting to learn about "moonquakes" - we've learned about the structure of the Earth's inside from what seismometers record during earthquakes, so it's an obvious thought to try the same on the Moon. And while you're at it, what would they record if something hit the Moon? So NASA did it - crash a few discarded Lunar Modules on the Moon and see what the seismometers send back.