Astronomer Carl Sagan figured that the Milky Way houses a million societies. A more conservative claim is that the number is closer to 10, So why do these Brits disagree?
This famous formula, which was introduced by astronomer Frank Drake in , is a string of seven parameters that, when multiplied together, estimate the number of technologically adept societies in the galaxy. The parameters include the abundance of Earth-like planets, the fraction that spawn life, etc. They note that humans have been beaming signals into the ether for about a century. Whatever we on Earth have done, the rest of the universe has imitated perfectly.
Radar, broadcast television, Wi-Fi — all these uses for radio will disappear, and the aliens will move on to some other, unspecified technology.
You might not have any problem with that assumption. Radio is a very useful technology, based on some fundamental physics. It might be around for as long as the wheel. Once the team had a sample size of known rocky, temperate worlds orbiting sunlike stars, they were able to estimate how many exist across the entire galaxy. They found that between 37 and 60 percent of sunlike stars in the Milky Way should host a temperate, Earth-size world—and using a more liberal calculation of the energy needed for a world to be temperate, they found that as many as 58 to 88 percent of sunlike stars could have such a world.
Of course, many factors determine whether a world in the habitable zone is truly friendly for life. Planetary characteristics such as magnetic fields, atmospheres, water content, and plate tectonics all play a role, and those are difficult to observe on small, faraway worlds.
Now that astronomers have a good sense of how many worlds similar to Earth are strewn across the galaxy, they can continue working through the variables in the Drake Equation. Many of the remaining factors will be tough to pin down, including the crucial questions of how often extraterrestrials develop technologies that we could detect and the length of time such civilizations are detectable. Astronomers are tantalizingly close to figuring out the next factor in the equation: the fraction of habitable worlds on which life evolves.
Finding just one example of life beyond Earth would demonstrate that biology is not a cosmic fluke but rather a probable outcome, given the right ingredients.
And considering the amount of habitable real estate in the cosmos, many astronomers say that life is basically an inevitability. All rights reserved. Inching closer to contact The Drake Equation uses seven variables to estimate the number of detectable civilizations in the Milky Way.
From habitability to civilization Now that astronomers have a good sense of how many worlds similar to Earth are strewn across the galaxy, they can continue working through the variables in the Drake Equation. Share Tweet Email. Read This Next Wild parakeets have taken a liking to London. Animals Wild Cities Wild parakeets have taken a liking to London Love them or hate them, there's no denying their growing numbers have added an explosion of color to the city's streets.
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Rather than taking on human form, those sneaky aliens could be disguised as dogs, or cats, or some other kind of animal. Yes, they could readily roam around Earth and fit in, though they are restricted in a myriad of ways, else we humans would get suspicious. Perhaps their physical form constrains them to be shaped only into animals, or perhaps they are able to take over the bodies of animals and cannot do the same with humans humans might be uninhabitable, or our minds might be impervious to alien occupation, meanwhile animals are their easiest target.
Another possibility is that the aliens are immersed in another dimension, one that we cannot see or enter into. The British astronaut might have somehow miraculously become attached to a mini-portal into that other dimension, or there was leakage from the unseen dimension that happened while she was circling the Earth in outer space.
With that logic, we need to consider that they are hiding because they have no means to show themselves to us, or they are hiding because they are waiting for something to trigger them to come out of hiding. Most doomsday stories about such matters involve the aliens then killing off humans and opting to take over Earth, or as a minimum, turning humans into slaves of one kind or another.
A common favorite is that humans find themselves hazardously entering into a global catastrophic war and this somehow triggers the aliens to shift into action. It is important to clarify what I mean when referring to AI-based true self-driving cars. These driverless vehicles are considered a Level 4 and Level 5 , while a car that requires a human driver to co-share the driving effort is usually considered at a Level 2 or Level 3. Meanwhile, the Level 4 efforts are gradually trying to get some traction by undergoing very narrow and selective public roadway trials, though there is controversy over whether this testing should be allowed per se we are all life-or-death guinea pigs in an experiment taking place on our highways and byways, some point out.
You are the responsible party for the driving actions of the vehicle, regardless of how much automation might be tossed into a Level 2 or Level 3. Most pundits would agree that the advent of true self-driving cars is going to help humanity, allowing for access to mobility that today is overly limited.
Those that are mobility disadvantaged will find themselves finally able to get around. In addition, it is anticipated that the number of lives saved is going to be another tremendous benefit of true self-driving cars. Today, in the United States alone, there are about 40, deaths per year due to car crashes and another 2.
Might the emergence of AI self-driving cars somehow be the trigger for those hidden aliens to show themselves? Here are three notable reasons, each having their own separate merit as a trigger inducing basis.
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