by TED-Ed 563,115 views
View the full lesson: http://ed.ted.com/lessons/why-can-t-we-see-evidence-of-alien
Stand by for an animated exploration of the famous Fermi Paradox. Given the vast number of planets in the universe, many much older than Earth, why haven't we yet seen obvious signs of alien life? The potential answers to this question are numerous and intriguing, alarming and hopeful.
Lesson by Chris Anderson, animation by Andrew Park.
by Big Think 558,070 views
What would you say to an alien? Bill Nye, aka, 'The Science Guy,' who heads The Planetary Society, an organization that fosters ways for the public to be actively involved in space exploration, including the search for extraterrestrial life.
Be sure to check out http://facebook.com/ToshibaInnovation to see Bill Nye answering questions submitted by Facebook users for the "Consider the Following" series.
Bill Nye: Well, that's just like, just like StarTrek. Everybody speaks English very well. Sometimes they have accents, but . . . We think we know how we came to be here on our world. We've studied this. How did you come to be? What are you doing here? We've worked for millennia - or many, many orbits of the sun - to reach this level. We believe that we came to be about a hundred thousand orbits ago and that life itself started on our world about three billion orbits ago. When did life start on your world?And let me say, that's a nice hat. And then he or she would say, "It's my helmet, it's my space helmet, because your atmosphere is just—it's no good for me." And so on . . . I'd want to know where they came from. I'd want to know why they wanted—what were they doing asking me what I was doing? It would be great to know, though, we're not alone. That would be a heck of a thing. It would change the world. Directed / Produced byJonathan Fowler & Elizabeth Rodd
by slatenewschannel 38,808 views
We are not alone. Big time. Astronomers say that each of the 100 billion stars in the Milky Way probably has at least one companion planet. Until the first part of the 20th century, scientists believed our home galaxy was the entire universe and, until 1994,that the planets in our solar system were the only ones we knew. With the aid of the Kepler Spacecraft, launched in 2009, an international team of 42 scientists has been surveying millions of stars in the Milky Way. They've discovered that planets may be as plentiful as grains of sand on a beach, and that many stars likely host planets with mass five times that of earth. Some stars are home to gas giants like Jupiter. And some planets may circle not one but two stars--a phenomenon so unlikely it was previously only considered in science fiction. We may need to keep searching for ET, though; none of the planets detected so far appears suitable for conventional carbon-based life as known on Earth.