Earth's magnetic field has flipped its polarity many times throughout history. Based on geologic and fossil records, it seems that such a polarity reversal would have no dramatic effects for life on Earth.
Scheduled to launch Nov. 26, 2011, NASA´s next rover
mission to Mars includes the SwRI-built Radiation Assessment Detector, one of 10 instruments that will assess past and present habitability
of the Red Planet.
A new computer program may help track near Earth objects (NEOs) and compute more accurate orbits. Monitoring NEOs can help scientists determine whether or not they pose a risk to life's future on Earth.