Mercury – closest to Sun, small terrestrial planet
Venus – the Earth’s sister planet Cloud-covered surface Diameter Earth Mass Earth Density gm/cm 3 Slow and Retrograde rotation rotation period 243d = day on Venus revolution around Sun 225d = yr on Venus
Atmosphere and Greenhouse Effect Atmosphere CO % N % Clouds – SO 2, H 2 S, and droplets of sulfuric acid Temperature 860F Very dense, atm pressure 90x Earth
Venusian Surface – mapped by radar
Lander image
Mercator – projection map of surface features based on radar mapping Named surface features
Greenhouse Effect and Global Warming on Earth Greenhouse Gases CO 2 Methane CH 4 Nitrous Oxide N 2 O H 2 O
Zero degree reference is 30yr average ~