The infant Sun was also prone to fierce X-ray tantrums. Once the Sun's core was hot and dense enough to initiate hydrogen fusion, after about a few million years, the Sun became a steadier source of energy. This steadiness allowed life to develop on Earth. NASA's Marshall Space Flight Center in Huntsville, Ala., manages the Chandra program. TRW, Inc., Redondo Beach, California, is the prime contractor for the spacecraft.
Red color represents less absorbed X rays, while blue represents absorbed X rays.
Lightcurves for each sources are also shown. Red color represents less absorbed X rays, while blue represents absorbed X rays.