Very deep Chandra observation of the Tycho supernova remnant.
Image credit: NASA/CXC/Rutgers/K.Eriksen et al.
A long Chandra observation of Tycho has revealed a pattern of X-ray "stripes" never seen before in a supernova remnant.
This result could explain how some of the extremely energetic particles bombarding the Earth, called cosmic rays, are produced.(read source)