www.physorg.com/print1997132957.html June 30th … supernovae are stellar explosions that can be seen across the entire universe. Type 1a supernovae are used by researchers to observe the acceleration of the universe. It has long been known they exhibit considerable variation in their spectra – but the reasons why this is so have been unknown, or certainly so, until now. Scientists at the Niels Bohr Institute think they have the answer. They have shown that the supernovae are exploding asymmetrically and the difference in their appearance is simply due to the direction from which they are being observed.