An article published in “The Astrophysical Journal Letters” describes a research on the Tycho supernova remnant. That explosion was seen on Earth in 1572 in an event well documented. The expansion of the remaining materials is still interesting and a team of astronomers studied it with NASA’s Chandra X-ray Observatory, the NSF’s Karl G. Jansky Very Large Array (VLA) and many other telescopes to create a kind of film that shows it.