| 15 billion BC | Universe began (BIG BANG) |
| 10 billion BC | Our galaxy formed |
| 5 billion BC | Solar system (sun, earth and other planets) formed |
| 2 million BC | Homo sapiens emerged |
| 5000 BC | Writing invented |
| 1888 AD | Hertz produced radio waves |
| 1903 AD | Letter "S" sent by radio waves across Atlantic Ocean by Marconi |
| 1959 AD | Cocconi and Morrison proposed SETI |
| 1960 AD | First attempt to detect extraterrestrial civilizations by Drake |
| 1979 AD | First issue of COSMIC SEARCH |
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