Editing Giant-impact hypothesis (section)

=== Synestia hypothesis ===
One effort, in 2018, to homogenise the products of the collision was to energise the primary body by way of a greater pre-collision rotational speed.  This way, more material from the primary body would be spun off to form the Moon.  Further computer modelling determined that the observed result could be obtained by having the pre-Earth body spinning very rapidly, so much so that it formed a new celestial object which was given the name '[[synestia]]'.  This is an unstable state that could have been generated by yet another collision to get the rotation spinning fast enough.  Further modelling of this transient structure has shown that the primary body spinning as a doughnut-shaped object (the synestia) existed for about a century (a very short time){{Citation needed|date=July 2019}} before it cooled down and gave birth to Earth and the Moon.<ref name="Boyle_2017">{{cite web|last1=Boyle|first1=Rebecca|title=Huge impact could have smashed early Earth into a doughnut shape|url=https://www.newscientist.com/article/2132763-huge-impact-could-have-smashed-early-earth-into-a-doughnut-shape|website=New Scientist|date=25 May 2017|access-date=7 June 2017}}</ref><ref name="Lock_etal_2018">{{cite journal|last1=Lock|first1=Simon J.|last2=Stewart|first2=Sarah T.|last3=Petaev|first3=Michail I.|last4=Leinhardt|first4=Zoe M.|last5=Mace|first5=Mia T.|last6=Jacobsen|first6=Stein B.|last7=Ćuk|first7=Matija|title=The origin of the Moon within a terrestrial synestia|journal=Journal of Geophysical Research|volume=123|issue=4|pages=910|date=2018|doi=10.1002/2017JE005333|arxiv=1802.10223|bibcode=2018JGRE..123..910L|s2cid=119184520}}</ref>