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<blockquote data-quote="Thornir Alekeg" data-source="post: 5337518" data-attributes="member: 15651">It is interesting.&nbsp; It leads me to questions for some of the physics and astronomy folks here.They say the planet orbits a dwarf star that will live longer than our sun.&nbsp; Would that star have once been hotter and is now a dwarf star at the latter end of its life cycle?&nbsp; If so, then wouldn't any chance of water or atmosphere be much lower?&nbsp; What about other radiation?&nbsp; Being that much closer to the star, would there be higher radiation or is it all proportional to size and visible light intensity?&nbsp; The article states that the planet does not rotate much, so one side is almost always, the other dark.&nbsp; How do rotation and orbit correlate?&nbsp; I'm just thinking about our moon, with a rotation and orbit that are both about 28 days, so we always observe the same face from Earth.&nbsp; With a 37 day orbit, if the planet did not rotate at all then wouldn't it have a light/dark cycle of 37 days? Perhaps the definition of rotation is based only upon orientation to the sun, so the moon rotates on a 28 day cycle in relation to the sun, but not at all in relation to Earth?</blockquote>

[QUOTE="Thornir Alekeg, post: 5337518, member: 15651"] It is interesting. It leads me to questions for some of the physics and astronomy folks here. They say the planet orbits a dwarf star that will live longer than our sun. Would that star have once been hotter and is now a dwarf star at the latter end of its life cycle? If so, then wouldn't any chance of water or atmosphere be much lower? What about other radiation? Being that much closer to the star, would there be higher radiation or is it all proportional to size and visible light intensity? The article states that the planet does not rotate much, so one side is almost always, the other dark. How do rotation and orbit correlate? I'm just thinking about our moon, with a rotation and orbit that are both about 28 days, so we always observe the same face from Earth. With a 37 day orbit, if the planet did not rotate at all then wouldn't it have a light/dark cycle of 37 days? Perhaps the definition of rotation is based only upon orientation to the sun, so the moon rotates on a 28 day cycle in relation to the sun, but not at all in relation to Earth? [/QUOTE]

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