Similar Methods Using Other Media
Balloon mail is a similar method of sending undirected messages through the air. The advantage of balloon mail is that it can be launched anywhere and can in principle reach any point on Earth. A further advantage is that it can be launched more easily, since a bottle dropped into the ocean could be washed back to land by the surf.
The glass interior shell of the Westinghouse Time Capsules of the 1939 New York World's Fair and 1964 New York World's Fair was made of Pyrex, where the exterior metal casing was a special copper alloy of "Cupaloy" (1938) or "Kromarc" stainless steel (1965) to withstand the effects of 5000 years of time, when they are expected to arrive to the people intended.
The U.S. space agency NASA has launched several interstellar "messages in bottles." A graphic message in the form of a 6 by 9-inch gold-anodized aluminium plaque, known as the Pioneer plaque, was bolted to the frames of the Pioneer 10 (launched on March 2, 1972) and Pioneer 11 (launched on April 5, 1973) spacecraft.
In August and September 1977, NASA launched two spacecrafts, together called the Voyager Project. Each carries a 12-inch gold-plated copper disk, known as the Voyager Golden Record, containing recorded sounds and images representing human cultures and life on Earth.
In 1999, 2001, 2003 and 2008 the Yevpatoria RT-70 radio telescope has transmitted messages to any potential extraterrestrial civilizations:
- Cosmic Call
- Teen Age Message
- Cosmic Call 2
- A Message From Earth
Read more about this topic: Message In A Bottle
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