In1994 Hubble began seeing spots brighten in sequence along the central ring: the supernova ejecta smacking into the ring. 1994年哈伯开始观测到中央环上一连串的亮点,这代表超新星的喷出物霹雳啪啦地撞上了环圈。
They attacked different ecosystems in different ways on different timescales, ranging from days for reentering ejecta to months for dust in the stratosphere to years for sulfuric acid aerosols. 它们以不同的方式与时间尺度影响不同的生态系,例如,喷出的碎片只要数天就会降回地表,平流层的烟尘要花数个月,硫酸雨雾则要数年。
Ejecta \E*jec"ta\, n. pl. [L., neut. pl. of ejectus cast out. See {Eject}.] Matter ejected; material thrown out; as, the ejecta of a volcano; the ejecta, or excreta, of the body. [Webster 1913 Suppl.]