Timelapse by NASA Reveals How a Supernova Remnant Has Grown Over 25 Years
Kepler’s Supernova was first spotted in the night sky in 1604. Since then, astronomers have paid close attention to it, as its remnant (the debris fields left behind after a stellar explosion) has helped them measure the expansion of the universe. Now, this celestial body is at the heart of a project that’s a quarter of a century in the making.












































































