Saturday, October 6, 2007
Friday Galactic Blogging
Gravitationally locked pair M81 and M82 are caught in a dance which has them passing each other every several hundred million years. The brilliant blue spiral arms of M81 (left) are likely the result of gravitational effects due to their proximity, while M82 glows in X-ray frequencies for the same reason. Click the image to see the APOD page and a description; click again for a higher resolution view.