OGWW
Voyager Golden Record
In 1977, two Voyager probes carried gold records into space. The record contains sounds and images used to express various cultures and life on earth, in the hope of being discovered by other highly intelligent creatures in the universe.
Cover
The picture above is the cover of a gold record. Using mathematics and physics knowledge, tell alien life spacecraft origin and how to play this record correctly. Click on the cover to view the pattern explanation.
* The cover also contains a piece of high-purity uranium 238 whose decay to thorium 234 has a half-life of about 4.47 billion years, from which extraterrestrial life can calculate the launch date of the probe.