1.However, if a black hole passes through a cloud of interstellarmatter, or is close to another “normal” star, the black hole can accrete matter into itself.
2.DEM L71 presents a textbook example of the double-shock structure expected to develop when a star explodes and ejects matter at high speeds into the surrounding interstellar gas.
DEM L71是双激波结构的标准范例，人们认为其产生于恒星爆发并以高速向周围星际气体抛射物质的时候。收藏指正
