Across Britain, the old gas holders are being demolished to release inner-city space for re-development.

_80102110__q0a6112   _80150525_0q0a6409

For a century the national grid was supplied from these structures, a crude mixture of carbon monoxide and other volatile products from black coal, mined from abundant Carboniferous deposits.

_80574703_gasometer-01   th-1

The holders encouraged their own design and architecture

_80102599__q0a4388  _80150540__q0a6321


Now, natural gas is transmitted under pressure over long distances and there is no need for local storage systems.

The planet Neptune stores gas differently, the metal inside and the gas out:

Neptune,_Earth_size_comparison  220px-Neptune_diagram.svg

Beneath clouds of the outer atmosphere (1, above) there is also gas (2), ammonia, methane and hydrogen. Layer (3) is solid water and other ice. The core (4) is solid rock of silicates and metals.

[pictures from BBC]