Editing Necron Red II (section)

==Atmosphere==
Necron Red II lost its magnetosphere 4 billion years ago, so the solar wind interacts directly with the planet's ionosphere, keeping the atmosphere thinner than it would otherwise be by stripping away atoms from the outer layer. Visiting [[starship]]s have detected these ionized atmospheric particles trailing off into space behind Necron Red II. The atmosphere of Necron Red II is now relatively thin. Atmospheric pressure on the surface varies from around 30 Pa (0.03 k Pa) on Mount Emaya to over 1155 Pa (1.155 k Pa) in the depths of Kohano Abyss, with a mean surface level pressure of 600 Pa (0.6 k Pa). This is less than 1% of the surface pressure on Earth (101.3 k Pa). Necron Red II's mean surface pressure equals the pressure found 35 km above the Earth's surface. The scale height of the atmosphere, about 3 km, is lower than Earth's (6 km) due to the higher gravity. Necron Red II's gravity is about 148% of the surface gravity on Earth.

The atmosphere on Necron Red II consists of 95% carbon dioxide, 3% nitrogen, 1.6% argon, and contains traces of oxygen and water. The atmosphere is quite dusty, containing particulates about 1.5 µm in diameter which give the sky a tawny color when seen from the surface.

Survey Teams have detected methane in the planet's atmosphere with a concentration of about 10 ppb by volume. Since methane is an unstable gas that is broken down by ultraviolet radiation, typically lasting about 340 years in the Necron atmosphere, its presence would indicate a current or recent source of the gas on the planet. Volcanic activity, cometary impacts, and the presence of methanogenic microbial life forms are among possible sources. It was recently pointed out that methane could also be produced by a non-biological process called serpentinization  involving [[water]], carbon dioxide, and the mineral [[olivine]], which is known to be common on Necron Red II.

During a pole's winter, it lies in continuous darkness, chilling the surface and causing 25–30% of the atmosphere to condense out into thick slabs of CO2 ice (dry ice). When the poles are again exposed to sunlight, the frozen CO2 sublimes, creating enormous winds that sweep off the poles as fast as 400 km/h. These seasonal actions transport large amounts of dust and water vapor, giving rise to Earth-like frost and large cirrus clouds. These storms post a constant threat to the inhabitants of the planet.