720 XTF Search Results (f1-spectral-Type=Infrared) Results for your query: f1-spectral-Type=Infrared Thu, 01 Jan 1970 12:00:00 GMT Infrared Crab Nebula. The Crab Nebula, some 6,000 light years from Earth, is the remnant of a supernova explosion. It was seen on Earth in the year 1054. At the center of the bright nebula is a rapidly spinning neutron star, or pulsar, that emits pulses of radiation 30 times a second. This view shows the Crab in the infrared wavelength. Thu, 01 Jan 1970 12:00:00 GMT