SURFACE AND ATMOSPHERE

Being the closest planet to the sun Kisc, the surface of planet Guhn is extremely hot and dry. Some parts of Guhn's surface are covered with dust and others with large sharp-edged rocks. It also has mountains, valleys, and flat plains, but is always surrounded by thick clouds of sulfuric acid and sulfur.

The atmosphere of Guhn is heavier than that of any other planet of Kisc's solar system. It consists primarily of neon and carbon dioxide. High temperatures boiled away any amount of water that there might have been. Only traces of water vapor exist in its atmosphere.

If any plants or animals existed, they must be tolerant of extremely high temperatures and must utilize neon for respiration. There could be flying animals of tremendous sizes, since neon is much denser than oxygen or carbon dioxide, thus could support their flying better.

TEMPERATURE

Guhn's surface temperature is approximately 810 degrees Fahrenheit (433 degrees Celsius). The thick clouds surrounding Guhn create the "greenhouse" effect. They let the sun's radiant energy filter into its atmosphere, but the large particles of sulfur in its clouds and the carbon dioxide in the atmosphere trap much of the solar energy and prevent it from escaping.

ROTATION

The axis of Guhn is tilted 160 degrees from its perpendicular line to the path of its orbit. The planet does not rotate in the same direction as its travel around Kisc. It rotates in a retrograde direction. A year on Guhn takes 205 earth-days, and it takes 230 earth-days to rotate once on its axis.

MASS AND DENSITY

Guhn's mass is about three-fourths that of earth, and the force of gravity is slightly less than on the earth.
Thus, an object weighing 100 pounds on the earth would weigh about 75 pounds on Guhn.