Twin Thick atmosphere opaque to visible light. Venera 8 lasted 1 hour. Mars Easy to observe from Earth. Can see through atmosphere. Red with permanent dark regions and polar caps.
Some valleys look like river valleys on earth.
Islands in stream beds. Maybe caused by melting due to subsurface ice. Two moons, Phobos and Deimos, are captured asteroids. Alternating bands, parallel to equator but different colors. Great Red Spot, southern hemisphere.