Task: Text Categorization
Input (English): Their spectra are similar to those of Seyfert Galaxies, and the BL Lac objects were once classified as a type of these. The spectra of many of these objects contain a series of absorption lines at the Lyman alpha transition wavelengths. 3C 273 was the first of these objects discovered by Sandage and Mathews in the Virgo cluster, and its spectrum indicated its redshift implied it had 90% of the velocity of light. Some of these objects have been measured to be as far away as thirteen billion light years. For 10 points, name these objects, believed to be an accretion disk powered by a supermassive black hole, and the oldest, farthest, and brightest objects detected in the night sky.
Output (English): Science