Hacker News
- The Big Dipper as it was. The stars are in motion and they do move, albeit very slowly. This is how the Dipper would have appeared to our ancestors 50,000 years ago http://www.astronomy.ohio-state.edu/~pogge/teachres/artwork/stars/bigdipperpm1.gif 225 comments space
- GPS, time dilation, and the importance of Relativity http://www.astronomy.ohio-state.edu/~pogge/ast162/unit5/gps.html 25 comments science