Canadian scientists have discovered 1.5 billion light-years of alien signals, hahaha, this is my signal, I am the first person in the universe! Eight-character Zhouyi is proficient in geomantic omen

This message is full of loopholes. First, how can the signal be judged to be 1.5 billion light years? Second, if it is 1.5 billion light years, then the message was sent 1.5 billion years ago. Furthermore, if the signal source travels at a speed of 3 billion light years in four years, it should have arrived at the earth before we received the signal. It is most likely that the signal was originally sent by the earth, but it only returned to the earth after reflection or black holes crossed. Aliens may exist, but it is impossible to walk 3 billion light years in four years with the same Moss code as ours. With such a LOW signal, it can only be said that science has limited our imagination?