Aliens have not gotten in touch. They might think Earth is dull.
A paper published to the arXiv suggests that intelligent extraterrestrials may not find planets that host life interesting. Amri Wandel, an astronomer at The Hebrew University of Jerusalem, wrote in the paper that aliens might be interested in the ones where there are signs of technology. The paper is still being reviewed.
The study theorizes that intelligent aliens would have developed long-distance space travel by now, and that they would have visited Earth. It is possible that there is no other intelligent life in the universe.
According to experts, the missing aliens may have visited Earth in the past, before humans evolved or were able to record the visit. Maybe long-distance space travel isn't as easy as thought. Maybe aliens didn't make it to Earth in time. They have decided not to look at the universe. It is1-65561-65561-65561-65561-6556 is1-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-6556
Aliens haven't visited Earth. There is an answer scientists have.
There is a possibility that life is common in the Milky Way. If many of the rocky planets around the stars host life, aliens probably won't waste their resources trying to communicate with each one, and they'd likely end up trying to communicate with amoebas.
Intelligenced aliens are more interested in signs of technology if it's common. Tech signals might be hard to detect. Since the 1930s, Earth has only been able to beam out signals from space. In theory, these signals have washed over thousands of stars and their planets, but that is a tiny fraction of the up to 400 billion stars in the universe. Since Earth started broadcasting off-planet, only stars within 50 light-years have had time to reply.
Even worse, Earth's oldest radio signals weren't deliberately broadcast into space, so they're likely garbled after a single light-year, so aliens wouldn't be able to distinguish them. The first high-power broadcast to aliens was made in 1974 by Earthlings. Scientists think it's time to send another one.
It's likely that Earth's signals haven't reached another form of intelligent life unless intelligent civilizations are plentiful. With time, and as our planet beams out more and more radio chatter, it becomes more likely that intelligent people will listen to it.
He wrote that the findings suggest that there is no intelligent civilization on our planet. intelligent life is just waiting for us to call.