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Will our world come to an end? Will Earth be d___1____? Maybe.
S__2___ say that the sun has a baby brother, a dark star. The star may bring
showers of comets( 彗星) and meteorites (陨石) to Earth and c____3___ disasters for all living things on Earth
The dark star,n__4___ “Nemesis(复仇女神)” by astronomers（天文学家）, is thought to move a___5____ the sun. Its orbit(轨道)is so large that it is measured in l__6___ years.
The research suggests that every 2,600 years, the star comes very c_7____ to the sun. the star is followed by billions of bits of cosmic rubble. (宇宙碎石)The rubble was left when planets were formed billions of years ago. Every time Nemesis v____8____ this area, it throws out millions of rocks. Some rush in the d______9____ of Earth. If the rocks hit Earth, all life will d____10_____.