A high - altitude plateau 5000 meters above sea levelA high - altitude plateau 5000 meters above sea level
Eavesdropping on outer space- search ????other civilizations have been going on for 50 years, but the results are scantyEavesdropping on outer space- search ????other civilizations have been going on for 50 years, but the results are scanty
Shining stars on a background of green glow in spaceShining stars on a background of green glow in space
Plateau at an altitude of 5000m with an observatoryPlateau at an altitude of 5000m with an observatory
Antennas on the background of a beautiful starry skyAntennas on the background of a beautiful starry sky