Scientists look for alien signalssignals/ˈsɪɡnəlz/L1信号：传递信息的声音或电波。Signals are messages or sounds that are sent to tell something. in space. They search for very narrow radio signals. But a new study says stars can change these signals. Plasmaplasma/ˈplæzmə/L2等离子体a gas-like state of matter made of charged particles, found in stars and lightning and stormsstorms/stɔːrmz/L1风暴：强烈的风、雨，或恒星上的大爆发。Storms are strong winds and rain, or big explosions on a star. from stars spread the signal out, so it is hard to find. This is a big problemproblem/ˈprɒbləm/L1问题；难题A problem is something that is hard to fix or makes trouble. because many stars are M-dwarfm-dwarfL1m-dwarf stars.
Scientists at the SETI Institute did a new studystudyL1Pemeriksaan kritis yang mendetail.a detailed critical inspection. They used data from spacecraftspacecraftL1Kapal luar angkasaa craft capable of traveling in outer space near Earth. They learned how plasmaplasma/ˈplæzmə/L2等离子体a gas-like state of matter made of charged particles, found in stars and lightning changes signals. Now they know why we do not hear aliens. They feel very surprisedsurprisedL1Terkejut secara tiba-tibataken unawares or suddenly and feeling wonder or astonishment and will look for widewide/waɪd/L1宽的：从一边到另一边距离很大的。Wide means a big distance from one side to the other. signals.
