Officials say that a raging wildfire that started Sunday morning approximately a half-mile from the Biosphere 2 science facility near Oracle Junction has been fully contained.

The fire’s cause has yet to be determined. The fire grew to about 13 acres by Sunday afternoon and remained that size until it was put out.

Crews from the State Forestry, Golder Ranch Fire District and Northwest Fire District battled to keep the wildfire from reaching the Biosphere facility. State Forestry launched single-engine air tankers to distribute water to assist with the efforts.

No evacuations were ordered.

Officials at one point were concerned for the Biosphere 2 structure which was built between 1987 and 1991 as part of testing closed ecological systems and human life in outer space. The facility is now owned and operated by the University of Arizona.