The naively expected density of the surface atmosphere stands at about 322 kilograms per cubic meter (compared to 1.2 kilograms per cubic meter at sea level on Earth). At the surface the temperature comes close enough to the critical point of water (temperature = 374 Celsius 705 Fahrenheit : pressure = 22.1 megaPascals 217.755 atmospheres) that during the night the atmosphere begins to condense into the liquid state and falls as raindrops 9 to 15 meters (30 to 50 feet) wide. Tenebra has an atmosphere "consisting of water heavily laced with oxygen and oxides of sulphur". Clement also describes the planet as rotating on its axis in a little less than four Earth days. 27 times the mass of Earth, Tenebra is three times Earth's diameter (38,226 kilometers 23,746 miles) and has three times Earth's gravity at its surface (29.43 meters per second per second 96.6 feet per second per second), which gives Tenebra an escape velocity of 33.558 kilometers per second (nearly 21 miles per second). Revolving on an orbit about the star Altair, Tenebra is an example of one of Hal Clement's "hellworlds". Its first hardcover book publication was in July 1964. The novel was first serialized in three parts and published in Astounding Science Fiction magazine in 1958. Close to Critical is a science fiction novel by American writer Hal Clement.
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