A、The explosion detected is the most distant one ever witnessed. B、The explosion detected is the most ancient one ever witnessed

Astronomers have detected the most distant explosion ever witnessed in the heavens. It was a flash so powerful that they could observe the faint light as it came in from almost the edge of the known universe. The U. S. space agency’s Swift satellite was routinely scouring the cosmos for exploding stars on September 4 when it spotted what scientists have since realized is the most distant such burst on record.
  In astronomy, distance means time. The further something is away, the longer its light has been traveling to get to us. So the star blast is also the most ancient ever observed.
  The exploding star the Swift satellite observed was typical of the death of a massive star. These blasts am the most powerful in the universe, sending out 100 million times the energy the Sun does in one year. They are not rare, but occur daily, emitting their light in high energy gamma rays. If you could see gamma rays, the sky would twinkle with such bursts.