“So new were the X-rays, said Dr. Soderberg, that she and her collaborators did not know they were…”

“So new were the X-rays, said Dr. Soderberg, that she and her collaborators did not know they were looking at an incipient supernova until a day or two later and ground-based telescopes had seen it grow in visible light.”

Scientists See Supernova in Action – New York Times

“So new were the X-rays, said Dr. Soderberg, that she and her collaborators did not know they were looking at an incipient supernova until a day or two later and ground-based telescopes had seen it grow in visible light.”

Scientists See Supernova in Action – New York Times