Cosmic Rays Trace Sun's Journey Through Space (ABC Science)

Hans-Reinhard Mueller, research associate professor of physics and astronomy, and Priscilla Frisch from the University of Chicago believe changes in the isotopes of some elements in the earth's geologic record could hold clues about our sun's journey through our galaxy, the Milky Way. Their hypothesis is noteworthy because it takes the sun 220 million years to complete each orbit of the galaxy, and it can be difficult to detect the local interstellar medium because it emits very little light.

Read the full story, published by ABC Science on 11/3/10.