... Star Atlas . ... Supernova showered Earth with radioactive debris . ... galaxies . ... Cosmic Adventures . ... Exploding stars and stripes in Tychoт??s supernova remnant . ... The upper panel shows a close-up of a region away from the stripes, where the black lines show tangled magnetic field lines and the red line shows an electron spiraling around one of these lines. ... Supernova remnants have long been considered a good candidate for producing the most energetic cosmic rays in our galaxy. ...