Reverse Shock Waving Moving At Mach 1000 Lights Up Tycho's Supernova
When a star goes supernova, it shines brightly for a few weeks or months before fading away. Yet the material blasted outward from the explosion glows hundreds or thousands of years later, leaving a picturesque supernova remnant. But how? Tycho's supernova was witnessed by astronomer Tycho Brahe in 1572. The appearance of this "new star" stunned those who thought the heavens were constant and unchanging. At its brightest, the supernova rivaled Venus before fading from sight a year later. Modern astronomers know that the event Tycho and others observed was a Type Ia supernova, caused by the explosion of a white dwarf star. The explosion spewed elements like silicon and iron into space at speeds of more than 11 million miles per hour (5,000 km/s). read more