NASA has released a 25-year time-lapse video of Kepler's Supernova Remnant, created from Chandra X-ray Observatory data spanning 2000 to 2025. The footage shows the expanding debris from the 1604 stellar explosion, revealing uneven expansion rates. The lower part of the remnant moves faster, at 13.8 million mph, while the upper part moves slower due to denser surrounding gas. This phenomenon helps scientists study supernova energy, element distribution, and the universe's expansion.