firehose instability
... that the absence of dark matter halos and elliptical galaxies with axis ratios more extreme than 3:1 is probably due to the firehose instability?
... that the absence of <a href="./Dark_matter_halo" id="mwFLo" rel="mw:WikiLink" title="Dark matter halo">dark matter halos</a> <i id="mwFLs">(example pictured)</i> and <a class="mw-redirect" href="./Elliptical_galaxies" id="mwFLw" rel="mw:WikiLink" title="Elliptical galaxies">elliptical galaxies</a> with axis ratios more extreme than 3:1 is probably due to the <b id="mwFL0"><a href="./Firehose_instability" id="mwFL4" rel="mw:WikiLink" title="Firehose instability">firehose instability</a></b>?