(Description) Figure 15 Remnants of Kepler’s supernova that exploded over 400 years ago, the bubble-shaped shroud of gas and dust is 14 light-years wide and is expanding at 4 million miles per hour (2,000 kilometers per second).

Week 2: Travelling from star birth to star death

This image shows the remnants of Kepler’s supernova that exploded over 400 years ago.