Sky at Night Magazine - - BULLETIN -

‘Oumuamua, the as­ter­oid that passed through the So­lar Sys­tem in Oc­to­ber 2017, was prob­a­bly thrown out into deep space from a bi­nary star sys­tem. A new study by Univer­sity of Toronto Scar­bor­ough’s Alan Jack­son shows that bi­nary star sys­tems eject rocky bod­ies from or­bit, while sin­gle star sys­tems like our own hurl out more icy ones. The 200m-long as­ter­oid prob­a­bly started life around a hot, high-mass star, but was thrown out dur­ing the for­ma­tion of its plan­ets.

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