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Alien Planet - timeline
The unmanned space probe Von Braun begins its 6.5 light-year journey to the Earth-like planet Darwin IV in hopes of finding life. (Earth Orbit)
The unmanned space probe Von Braun arrives at the Earth-like world Darwin IV; two landers discover a complex multicellular ecosystem, and are ultimately destroyed by a a pre-technological intelligent species due to an unidentified misunderstanding. (Darwin Binary Star System)
Transimissions from the unmanned mission to Darwin IV reach Earth via a laser, confirming multicellular and intelligent life exists on Darwin IV. (Earth)