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231 sats \ 11 replies \ @nullama 28 Aug 2023 \ on: How many people here believe that man did go to the moon? meta

You don't have to trust anyone.

There are at the moment 6 retroreflectors on the moon (3 left by NASA, 2 by Russia, and a recent one from India).

https://imgprxy.stacker.news/2RB9RRIkvPpeHYL2S6Hi4Oei6uXY9H4z_Dqwl0kA-xM/rs:fit:600:500:0/g:no/aHR0cHM6Ly91cGxvYWQud2lraW1lZGlhLm9yZy93aWtpcGVkaWEvY29tbW9ucy90aHVtYi8wLzA4L0Fwb2xsb18xMV9MdW5hcl9MYXNlcl9SYW5naW5nX0V4cGVyaW1lbnQuanBnLzE5MjBweC1BcG9sbG9fMTFfTHVuYXJfTGFzZXJfUmFuZ2luZ19FeHBlcmltZW50LmpwZw

The one from Apollo 11 is the LRRR (Laser Ranging Retroreflector) and is located at Mare Tranquillitatis.

https://imgprxy.stacker.news/DEuqrS8Kxzfw4gX4KugW0wqStvgSIxoFiIPaQ74oVzg/rs:fit:600:500:0/g:no/aHR0cHM6Ly9pLmltZ3VyLmNvbS9lNk5XWGhGLnBuZw

The Laser Ranging Retroreflector (LRRR) was the first ever deployable lunar laser ranging experiment. It was carried on Apollo 11 as part of the Early Apollo Scientific Experiments Package

The LRRR consists of a series of corner reflectors set within a panel. Laser beams sent from Earth are bounced off the retroreflector and the timing of the return signal can be used to measure the distance from the signal source to the reflector.

https://imgprxy.stacker.news/tJl5i-Vykr8OrSPhhGFGiijOtfbVLWIaHocOz3fI71Q/rs:fit:600:500:0/g:no/aHR0cHM6Ly93d3cubmFzYS5nb3Yvc2l0ZXMvZGVmYXVsdC9maWxlcy90aHVtYm5haWxzL2ltYWdlL2xhc2VyLmpwZw

You can read here more about how they send lasers and measure the time it takes for the laser to bounce back from those retroreflectors.

0 sats \ 1 reply \ @sudonaka 28 Aug 2023

So the astronauts had to put those mirrors down on the surface or could it be mounted on top of a rover?