July 20/18: I really need to get this course done! Joe's holidays and honey harvest start in eight hours! Euclidean, spherical, and hyperbolic space curvatures?!! Plus I need to go find out what just got sprayed on our sweet white clover. 😱
I just finished reading "Relativity and Cosmology"! Yes, just a single article can take multiple days. Now to read about dark energy and see how well I did in the entire course! I thought about taking biology too, but will definitely take a break from the sciences, first! 🤓
The written article seems to be much longer than the audio, and therefore, much longer than I expected. This is just an excerpt, clear as mud, of course! :D I actually happy dance love it! At best, we know 4% of what there is to know. Who doesn't love a good mystery?!... "For thousands of years our species has studied the night sky and wondered if anything else is out there. Last year we celebrated the 400th anniversary of Galileo’s answer: Yes. Galileo trained a new instrument, the telescope, on the heavens and saw objects that no other person had ever seen: hundreds of stars, mountains on the Moon, satellites of Jupiter. Since then we have found more than 400 planets around other stars, 100 billion stars in our galaxy, hundreds of billions of galaxies beyond our own, even the faint radiation that is the echo of the Big Bang.
Now scientists think that even this extravagant census of the universe might be as out-of-date as the five-planet cosmos that Galileo inherited from the ancients. Astronomers have compiled evidence that what we’ve always thought of as the actual universe—me, you, this magazine, planets, stars, galaxies, all the matter in space—represents a mere 4 percent of what’s actually out there. The rest they call, for want of a better word, dark: 23 percent is something they call dark matter, and 73 percent is something even more mysterious, which they call dark energy."
ok, I love learning and this is cool. I just wish there weren't still starving children in the world while spending this kind of money... "(A dark energy satellite has been on and off the drawing board since 1999, and last year went “back to square one,” according to one NASA adviser."
and what we do know might be a little bent! "According to Albert Einstein’s theory of general relativity, a beam of light traveling through space appears to bend because of the gravitational pull of matter. (Actually, it’s space itself that bends, and light just goes along for the ride.)"
might be the best quote of the day: "it is sight itself that has blinded us to nearly the entire universe. And the recognition of this blindness, in turn, has inspired us to ask, as if for the first time: What is this cosmos we call home?"