News Picks : Cold spot in cosmic background radiation may just be cosmic void
New Scientist: When the cosmic microwave background (CMB) radiation was mapped, a large cold spot was revealed. The current theory of inflation doesn't predict the existence of such an area, so many exotic theories have been proposed to explain it. István Szapudi at the University of Hawaii in Honolulu and his colleagues have found evidence that suggests a much simpler solution. They examined the all-sky survey data from the Wide-field Infrared Survey Explorer and found a large void that is 1.8 billion light-years across and located 2.8 billion light-years from Earth. As the CMB passed through this huge area of space that is devoid of matter, it could have lost enough energy to create the cold spot. The void they found is the largest so far and is twice as large as the previous largest known void.