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The Fermi Paradox - Wait But Why

The Fermi Paradox - Wait But Why
PDF: We made a fancy PDF of this post for printing and offline viewing. Buy it here. (Or see a preview.) Everyone feels something when they’re in a really good starry place on a really good starry night and they look up and see this: Some people stick with the traditional, feeling struck by the epic beauty or blown away by the insane scale of the universe. Personally, I go for the old “existential meltdown followed by acting weird for the next half hour.” Physicist Enrico Fermi felt something too—”Where is everybody?” A really starry sky seems vast—but all we’re looking at is our very local neighborhood. Galaxy image: Nick Risinger When confronted with the topic of stars and galaxies, a question that tantalizes most humans is, “Is there other intelligent life out there?” As many stars as there are in our galaxy (100 – 400 billion), there are roughly an equal number of galaxies in the observable universe—so for every star in the colossal Milky Way, there’s a whole galaxy out there. 1. 2.

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125 Great Science Videos: From Astronomy to Physics & Psychology Astronomy & Space Travel A Brief, Wondrous Tour of Earth (From Outer Space) - Video - Recorded from August to October, 2011 at the International Space Station, this HD footage offers a brilliant tour of our planet and stunning views of the aurora borealis.A Universe from Nothing - Video - In 53 minutes, theoretical physicist Lawrence Krauss answers some big enchilada questions, including how the universe came from nothing.A Year of the Moon in 2.5 Minutes - Video - The Lunar Reconnaissance Orbiter has been orbiting the moon for over a year. The footage gets compressed into 2 slick minutes.A Day on Earth (as Seen From Space) - Video - Astronaut Don Pettit trained his camera on planet Earth, took a photo once every 15 seconds, and then created a brilliant time-lapse film.Atlantis's Final Landing at Kennedy Space Center - Video - After more than 30 years, the space shuttle era comes to a close. Video runs 30 minutes. Physics

The Most Beautiful and Famous Trees on Earth “A tree is a wonderful living organism which gives shelter, food, warmth and protection to all living things. It even gives shade to those who wield an axe to cut it down” – Buddha. There are probably hundreds of majestic and magnificent trees in the world – of these, some are particularly special: How Religion Got in the Way For all those readers frustrated with the late posts, Why I Can’t Post On Time. “Wash your face before bed so the angels will come down and kiss you while you sleep.” That’s what my grandmother told me when I was a child staying over at her house. I was about five years old, and not only did this information from a trusted authority not faze me, it was a very standard sort of thing for someone to tell me.

Gravitational lens A light source passes behind a gravitational lens (point mass placed in the center of the image). The aqua circle is the light source as it would be seen if there was no lens, white spots are the multiple images (or Einstein ring) of the source. A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer. This effect is known as gravitational lensing, and the amount of bending is one of the predictions of Albert Einstein's general theory of relativity.[1][2] (Classical physics also predicts the bending of light, but only half that predicted by general relativity.[3]) Although Einstein made unpublished calculations on the subject in 1912,[4] Orest Khvolson (1924)[5] and Frantisek Link (1936)[citation needed] are generally credited with being the first to discuss the effect in print.

The Earthquake That Will Devastate Seattle When the 2011 earthquake and tsunami struck Tohoku, Japan, Chris Goldfinger was two hundred miles away, in the city of Kashiwa, at an international meeting on seismology. As the shaking started, everyone in the room began to laugh. Earthquakes are common in Japan—that one was the third of the week—and the participants were, after all, at a seismology conference. Top 10 Best Astrophotographers in the World The sky that we usually see and is considered to be an ordinary thing is in fact full of many wonders and secrets that need to be revealed but how to do this? Discovering more about the secrets that are hidden in the sky is costly and requires spending a long time trying to see the invisible objects and observe the changes that take place in front of your eyes using special equipment. The question is how to record all what you see and the amazing beauty of the invisible objects that can be found in the sky to enjoy watching them whenever you want? It is the role of the astrophotographers who come to dazzle us with the photos that they capture and are considered by many people to be unbelievable because of the stunning beauty that can be found in them. Patience is highly essential for capturing exceptional photographs as you have to keep looking at the sky with your eyes wide open waiting for the right and most exciting moments to capture.

Revelation A Revelation If we could shrink the earth's population to a village of precisely 100 people, with all the existing human ratios remaining the same, it would look something like the following: There would be: 57 Asians 21 Europeans 14 from the Western Hemisphere, both north and south 8 Africans A Religion for the Nonreligious The mind…can make a heaven of hell, a hell of heaven. ― John Milton The mind is certainly its own cosmos. — Alan Lightman You go to school, study hard, get a degree, and you’re pleased with yourself. But are you wiser? You get a job, achieve things at the job, gain responsibility, get paid more, move to a better company, gain even more responsibility, get paid even more, rent an apartment with a parking spot, stop doing your own laundry, and you buy one of those $9 juices where the stuff settles down to the bottom. But are you happier?

Hypercube An n-dimensional hypercube is also called an n-cube or an n-dimensional cube. The term "measure polytope" is also used, notably in the work of H. S.

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