Huo Jinyi worries about earthly person continuously outward aerospace sends information to be able to greet disaster. Actually his be anxious is reasonable.
Above all, radio news of the earth is theoretic velocity of light can be done to travel in the universe. For example the earliest radio signal is already far be outside 100 light-year. But in the process that earthly information is transmitting, as the distance further and further meeting greets disintegration. Meet after transmitting a few light-year namely damply. Capable to can explore this kind of signal outside Xing Zhihui biology, degree of development of its science and technology wants than the mankind necessarily advanced. Once be locked up to decide signal to come by them,come from solar system so, probable meeting chooses to inbreak solar system. The 3 body person in resembling 3 body is same, they may arrive later in hundreds of years the earth, next colony ball person, this is not fun word. 
Next, radio news of the earth is intercepted and capture in 100 light-year tegument today for example, capable to receive the extraterrestrial wisdom rate of such signal affirmation is more advanced than the mankind, of course not certain and advanced how many, this also can need not be anxious. But, for example after this signal passes a few all ages that is to say its transmitted tens of thousands of light-year to be intercepted and capture by another wisdom biology in the universe, so their ability may be similar the song in 3 body person civilization is in that way super outside the star is civilized. Since they can intercept and capture disintegration radio signal of tens of thousands of years, so can be imagined their ability is the same as the earth necessarily is not an amount class. That is to say, what signal travels is further, capable to intercept and capture the civilization of this signal to be amounted to even more, because signal is met of attenuation, radio signal of the mankind transmits 100 light-year, with human development degree identical civilization did not have method to receive, can receive so travelled hundreds of years in the universe, of signal of radio of mankind of a few all ages outside the star is civilized, inevitable and special develop.
Someone says, does for what then fast radio explode can be you received by the mankind? Because fast radio is eruptive,that is send energy great, so that a few all ages travelled in the universe,still also be very apparent be received by the mankind. But the radio signal power that the mankind projects to the universe has a few tile only, a few light-year travel in the universe, ten light-year already special faint, annihilate is in microwave setting radiate. So capable to be in hundreds of light-year, human radio information receives outside tens of thousands of light-year outside the star is civilized, it is the sort of divine form culture necessarily, if they are inferior to the mankind developing, also do not receive human radio information necessarily, also won't discover.
So, of Hocking be anxious very reasonable. Because the world is civilized,had transmitted countless radio signal to aerospace now. Farthermost had transmitted 100 light-year. Rate of development of or extraterrestrial civilization is low cannot receive these signal, these signal are not discovered. Once be received by the extraterrestrial, this outside astral civilization is to should compare earthly person necessarily at least advanced thousands of years. More distant outside the star is civilized, if they can receive earthly signal, so their civilized degree is to be amounted to even more necessarily. Nevertheless the mankind need not worry too. Because of earthly radio signal already farthermost transmission arrives outside 100 light-year, if be received by the extraterrestrial, so had they not come now for what the earth? Also need not worry too too. But the mankind after tens of thousands of years is about to worry very much, because awaited earthly radio signal to perhaps had spread everywhere to a galaxy in those days, galaxy radius does not pass gift 50 thousand light-year just, we are apart from galaxy brim 23 thousand light-year, distance silver-colored heart 27 thousand light-year.
