Extraterrestrial atmosphere star undergoing runaway greenhouse effect. For planets in the habitable zone, it was thought that water photolysis would be strongly limited by cold-trapping of water vapour in the lower atmosphere. However, the extent of HO cold-trapping depends strongly on the amount of non-condensible gases in the atmosphere such as nitrogen N and argon. In the absence of such gases, the likelihood of build-up of oxygen also depends in complex ways on the planet's accretion history, internal chemistry, atmospheric dynamics, and orbital state. Therefore, oxygen, on its own, cannot be considered a robust biosignature. The ratio of nitrogen and argon to
The Noble Sage Art Gallery writers and poets. They include: The Noble Sage Art Gallery The Noble Sage Art Collection is a contemporary art gallery in Belsize Park, North London. It was opened by Jana Manuelpillai in 2006. The gallery specialises exclusively in Indian, Sri Lankan and Pakistani contemporary art and represents over forty artists. The collection includes over 500 artworks, most of which are paintings, sculpture and works on paper from south Indian states of Tamil Nadu, Kerala and Karnataka. Artists shown at the gallery include: The Noble Sage holds regular screenings of art house films from the Indian Subcontinent. The Noble Sage has