A"planemo"(行質天體)orplanetarymassobjectsweredisplayedinthisundatedartist'srendering(示意圖).Toolightweighttobestars(恆星)butbiggerthanmostplanets(行星),ahandfulofhotyoungfree-floating(漂浮式)objectshavethematerialstomaketheirownmini-planetarysystems,astronomersreportedonMonday.Theseso-calledplanemoshavedisksofcosmicdustandgascirclingthem,whichcontainthekindsofingredientsthatastronomersbelieveEarthandtheotherplanetsinoursolarsystemwereforgedfrom. Reuters
畫家這幅沒註明日期的示意圖顯示行質天體情況,天文學家周一指,行質天體是質量較輕,不足以稱做恆星,但比大部份行星重,是少數熾熱的漂浮式星體,有物質組織自己的迷你行星系。行質天體有幾重宇宙塵埃和氣體包圍它們,裏面含有天文學家相信是製造地球和太陽系中其他行星的成份。 路透社