Cassiopée A, Kepler et Tycho

Each work is a gradient composed from spectrometric data of three supernovae (explosion of a star). The colors correspond to the components, chemical elements such as Neon, Magnesium, Silicon, Sulfur, Argon, Calcium, Iron. 

Astronomers have discovered that the matter that makes up the Earth is the same throughout the cosmos. The violent explosions of stars, supernovae, are one of the most important source of matter and energy of our Universe. The spectrometry and the electromagnetic field (as visible light, Gamma ray or ultraviolet) are tools to understand and define the type of matter that composes celestial objects within distance.