01 May '11, 12am

Very cool picture of Earth's magnetosphere from @NASA_EO

You've seen the pattern in science class when you laid bits of iron around a bar magnet. The invisible force field around the magnet becomes suddenly visible when the iron filings fall into line. The iron-cored Earth behaves like a great magnet, and scientists have spent a century exploring its shape and structure. The visualization above shows the magnetic field around Earth—the magnetosphere—as it might look from space. This view is conceptual, but based on real science observations that have been made since the beginning of the Space Age. The orange and blue lines depict the opposite north and south polarity of Earth's field lines. The field lines are not actually visible, but they can be detected by sensors that count atomic particles—charged protons and electrons moving in the space around Earth. Unlike the symmetrical pattern of the iron filings and magnet, the magne...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=50208


13 Most Beautiful Bridges on Earth

13 Most Beautiful Bridges on Earth

environmentalgraffiti.com 01 May '11, 5pm

The Tower Bridge in London is iconic, yet tourists occasionally refer to it as London Bridge, which is the next one over. ...