Our Sun Is Moving Slower Than Thought
The sun is moving through the Milky Way slower than previously thought, according to new data from a NASA spacecraft. From its orbit around Earth, the Interstellar Boundary Explorer (IBEX) satellite measured the speeds of interstellar particles entering at the fringes of our solar system, 9 billion miles from the sun.
Plugging the new data into computer models, the IBEX team calculates that the sun is moving at about 52,000 miles an hourâ€”about 7,000 miles slower than thought. The discovery suggests that the protective boundary separating our solar system from the rest of the galaxy is missing a bow shock, a major structural component thought to control the influx of high-energy cosmic rays.