An instrument on the Indian lunar orbiter Chandrayaan-1 revealed a cave that is about 130 yards wide and just over a mile long near the moon's equator, in the Oceanus Procellarum area.
The scientists identify such caves as lava tubes, which they say “provide a natural environmental control with a nearly constant temperature of minus 20 degrees Celsius, unlike that of the lunar surface showing extreme variation, maximum of 130 degrees Celsius to a minimum of minus 180 degrees Celsius in its diurnal (day-night) cycle.
Read more on Newsmax.com: Moon Cave Could Shelter Astronauts, Scientists Say
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http://www.newsmax.com/SciTech/moon-cave-astronauts-India/2011/03/01/id/387923
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