We’ll start the week finishing the biological basis of evolution, and then work into physical origins. Please review the links from last week, especially on DNA.
Here’s a cool YouTube video of the “known universe” produced by the American Museum of Natural History. This puts us in our place (cosmically!) and demonstrates the awesome dimensions of this week’s topic. I also enjoy this digital atlas of the Universe from the Hayden Planetarium. It is a significant download, but very nice. Here is a great interactive website on the Scale of the Universe. These sites give us perspective.
NASA has an excellent website on cosmology. For those of you looking for a simple red shift explanation, click away on this colorless but useful PBS webpage. It even has exercises you can try. There is a nice Big Bang animation on this French website; I may use it in class (despite the French).
This star formation site is easy to follow and understand (more or less). The JPL-NASA Solar System site has the latest news and fantastic images. The NASA Mars Mission webpages are, of course, incredible. This webpage from NOVA has superb animations of the “Big Whack” hypothesis for the origin of the Moon.
Here is the homepage of NASA’s “Stardust” project, which brought to Earth the “dust” of a comet. Now you know the importance of this study to our ideas about the origin of the solar system because comets are samples of the original solar nebula.
Now for the complex and contentious ideas about the origin of life. The elaborate and elegant Exploring Life’s Origins website from the Museum of Science in Boston is the best on the topic. Here’s a good animated Miller-Urey experiment webpage I may use in class.
Chemists have found a recipe to build all four nucleotides of RNA in a way that could have happened on the surface of the early Earth. This is a biological breakthrough that could show a theoretical pathway to the RNA World. Very cool.
If you are interested in being on the e-mailing list for the Department of Earth Sciences, please send me a note. You will receive departmental announcements about upcoming lectures, picnics, field trips, and internship opportunities.
Geology in the News –
The headline of this story is odd (“Dinosaur DNA clues unpicked by researchers at University of Kent“. What does “unpicked” mean?), but the story is interesting. It is an attempt to describe non-avian dinosaur diversity by estimating what their genome looked like. Birds (which are dinosaurs) are used for the calculations.
A cool new fossil turtle was recently found in China. It is not surprising that it lacks a shell; it is the preservation that is remarkable. It is 228 million years old. What geological time period is this?
Check out this frozen horse 30,000 years old! It is an extinct Lenskaya horse found in melting permafrost in Siberia. Check out the details preserved. I imagine DNA could be easily extracted from the carcass.