Project Echo

first passive communications satellite experiment

en-GB/ˈpɹɒd͡ʒɛkt ˈɛkəʊ/
en-US/ˈpɹɑd͡ʒɛktn ˈɛkoʊ/

ক্যাটাগরি:

artificial satellite of the Earthartificial satellitespacecraftballoon satellite