Arecibo Message
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Carl Sagan, along with Frank Drake, helped conceive the idea of sending a message from Earth to potential extraterrestrial civilizations using the Arecibo Observatory's powerful radio telescope in 1974. Sagan was known for his interest in the search for extraterrestrial intelligence (SETI) and his efforts to promote public understanding of science. He is considered as the father of Astrobiology.
This Arecibo Message was a deliberate attempt to communicate with extraterrestrial intelligence by sending a binary-coded message depicting basic information about humanity, Earth's position, and our understanding of mathematics and science.
The message was sent towards the globular star cluster M13, though due to the vast distances involved, any potential reply would take tens of thousands of years to reach us, if at all. This message remains a notable milestone in the search for extraterrestrial intelligence and in our efforts to understand our place in the cosmos.
Pioneer Plaque
The Pioneer plaque is a metal plate affixed to the Pioneer 10 and Pioneer 11 spacecraft, launched in 1972 and 1973, respectively. It carries symbolic information about humanity, including a depiction of a man and woman, the location of Earth in the Milky Way, and a diagram of the hyperfine transition of hydrogen, intended as a message to potential extraterrestrial civilizations.
Created by Carl Sagan and Frank Drake, the plaque symbolizes human curiosity and the desire to communicate with other intelligent beings in the universe.
The Sounds of Earth Record Cover
The "Sounds of Earth" record cover is a symbolic artifact included on the Voyager 1 and Voyager 2 spacecrafts, launched in 1977. It contains instructions on how to play a gold-plated copper phonograph record, intended as a message to any extraterrestrial civilizations that might encounter the spacecraft.
Curated by a committee chaired by Carl Sagan, the record includes sounds and images meant to portray the diversity of life and culture on Earth, serving as a time capsule of human civilization in the late 20th century.
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