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Stars without planets have 10 times the lithium as stars with planets in a sample of 500 stars.<ref name="Discover">{{cite journal |last1=Plait |first1=Phil |title=Want a planet? You might want to avoid lithium |date=Nov 11, 2009}}</ref> The sun has 1% of the amount of lithium in gas clouds. It is suspected that the gravitational pull of planets might churn up a star's surface driving the lithium to hotter cores where [[Lithium burning]] can take place.<ref name="Discover"/> The absence of lithium could also be a way to find new planetary systems.<ref name="Discover"/>
===Higher than expected lithium in metal-poor stars===
A few stars have been found with high amounts of lithium.<ref name="high">{{cite journal |doi=10.3847/2041-8213/aaa438}}</ref>
==Proposed solutions==
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