http://www.abc.net.au/science/articles/2012/05/11/3500202.htm
Excerpt:
Our solar system’s journey through space is slower and heading in a different direction to what was previously thought, according to new data.
The findings reported in the journal Science, also indicate the Sun appears to have a weaker interaction with the gas and dust that surrounds our solar system, known as the interstellar medium.
The new observations are based on fresh data from NASA’s Interstellar Boundary Explorer (IBEX) spacecraft.
Launched in 2008, IBEX is designed to map the boundary of the heliosphere, a bubble created by the Sun’s magnetic field and solar wind which contains the solar system.
The boundary where the heliosphere interacts with the interstellar medium, marks the edge of the solar system.