Wikipedia:Reference desk/Science: Difference between revisions
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Of course everything that circles the sun in an elliptical orbit has a perihelion (that includes Pluto and the minor planets (asteroids)). [[Special:Contributions/92.8.63.48|92.8.63.48]] ([[User talk:92.8.63.48|talk]]) 10:21, 15 December 2016 (UTC)
:I notice there's a 165-degree sector that none of these perihelia currently fall into, or in other words a weak clustering to (almost) one side of the Sun. This could of course be due to random chance, but I wonder if any gravitational effects of, say, "[[Planet Nine]]" could be influencing this. {The poster formerly known as 87.81.230.195} [[Special:Contributions/90.200.136.117|90.200.136.117]] ([[User talk:90.200.136.117|talk]]) 18:15, 15 December 2016 (UTC)
==is it so that comets have half life?==
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