Hipparcus indicates that our supposed closest star alpha centuari is 742 marcs away, which is about 1.3 pc or 4.3 yrs away. Stars form in multiple in open clusters of 100-1000; hence our sun probably has some sister stars at much closer distance, with higher parallax values. Also infrared telescope could be used to look for cold gas giants, and compare image size for relative closesness. In fact does the Brown dwarf survey, and other surveys, include some large gas giant planets, in infrared, which indicate a nearby sister star? Such sister stars would have a center of mass, and hence via central force, one would have a spherical distributed cometary cloud – a common Oort cloud? So does our Oort cloud enclose a multi-stellar system, of similar age? TMM
December 23, 2011
Hipparcus, and our multi-stellar system?
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