Stars are visible in the sky as Old Faithful erupts at dusk in Yellowstone National Park, Wyoming. When Old Faithful erupts, it can launch as much as 8,400 gallons (32,000 liters) of boiling water as high as 185 feet (56 meters), although the average eruption height is 145 feet (44 meters). The time between eruptions is growing longer on average, possibly because earthquakes have affected underground water levels. The current interval is either 65 or 91 minutes depending on attributes of the prior eruption.
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