Hughes XV-9A "Hot Cycle" 

XRS-2200 Linear Aerospike Engines Undergo Hot-Fire Test 

Geysers at Rotarura Park 

Steam Vents at Rotarura Park 

Steam Vents at Rotarura Park 

Steam Vents at Rotarura Park 

Volcanic Mud Pool at Rotarura Park, New Zealand 

Hot Springs Near Strokkur Geyser, Iceland 

Strokkur Hot Springs 

Steam Vents at Rotarura Park 

Apollo Command Module Hot and Cold Test 

Hughes XV-9A 

New Zealand Stream 

Steam Pools at Rotarura Park, New Zealand 

Volcanic New Zealand 

Steam Vents at Rotarura Park 

Lava Floes in Rotarura Park 

XV-9A Hot Cycle Helicopter on Tarmac 

XV-9A Hot Cycle Helicopter on Tarmac 

XV-9A Hot Cycle Helicopter Hovers Above Tarmac 

Hughes XV-9A Hot Cycle Helicopter in Flight 

XV-9A Hot Cycle Helicopter Hovers Above Tarmac 

Geothermal Sites in Rotorua, New Zealand 

Geothermal Sites in Rotorua, New Zealand