Cactus Knows No Borders

By: Wally Pacholka


Region: Americas

Site: Arizona - USA

Spot: Organ Pipe Cactus National Monument

Date: 2015 May 17

The Milky Way arc above the Organ Pipe Cactus National Monument and UNESCO biosphere reserve in extreme southern Arizona sharing a border with the Mexican state of Sonora. This is the only place in the US where the Organ Pipe Cactus grows wild. The green "clouds" are airglow, natural emission of the Earth upper atmosphere. The yellow-orange glow is the light from nearby towns. Wally Pacholka,

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