): 96.5% — This high concentration creates a runaway greenhouse effect, trapping solar energy and making Venus the hottest planet in the Solar System. Nitrogen ( N2cap N sub 2
The Venusian atmosphere is dominated by two primary gases that together account for more than 99.9% of its total volume: Carbon Dioxide ( CO2cap C cap O sub 2 Venusian (Atmospheric Mix)
): 3.5% — While a small percentage, the total mass of nitrogen on Venus is roughly four times higher than on Earth due to the sheer density of the Venusian atmosphere. Venusian (Atmospheric Mix)