"Brown dwarfs are born hot, then cool over time. And now one has been found that is literally as cold as ice. Not only that, but it’s very close to our solar system: Just 7.2 light years away! That makes it the seventh closest known star to the Sun."
"And this is the part that kills me: the best fit temperature he found was around 225–260 Kelvins. Even at the high end, that’s -13° C (9° F)."
Astronomer Finds a Star Literally as Cold as Ice … and It’s Right Next Door
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Mammatus Clouds over Nebraska
Image Credit & Copyright: Jorn Olsen Photography
http://apod.nasa.gov/apod/ap140415.htmlWhen do cloud bottoms appear like bubbles? Normally, cloud bottoms are flat. This is because moist warm air that rises and cools will condense into water droplets at a specific temperature, which usually corresponds to a very specific height. As water droplets grow, an opaque cloud forms. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate. Such pockets may occur in turbulent air near a thunderstorm. Resulting mammatus clouds can appear especially dramatic if sunlit from the side. The mammatus clouds pictured above were photographed over Hastings, Nebraska during 2004 June.
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