Arizona Daily Star
A Sunday wildfire burning about half a mile from the Biosphere 2 science facility near Oracle Junction was about 50% contained by the afternoon, officials said.
The wildfire started Sunday morning, Arizona State Forestry officials said.
The cause of the fire was not immediately known and had spread to around 13 acres by Sunday afternoon before being partially contained.
Crews from State Forestry, the Golder Ranch Fire District and the Northwest Fire District worked to prevent the wildfire from reaching the biosphere facility.
State Forestry launched single-engine tanker planes to help with suppression.
No evacuations have been ordered at this time, authorities said.
Biosphere 2 was built between 1987 and 1991 to test the viability of closed ecological systems and human life in space. The tests were held twice in the early 1990s.
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The facility is owned and operated by the University of Arizona.