was reported at 12.44° declination and 17.163 hours right ascension, and at an ecliptic latitude of 34.9° (the ecliptic latitude changes very slowly), placing it in the constellation Ophiuchus as observed from the Earth on May 21, 2011. On December 1, 2011, it was announced that Voyager 1 had detected the first Lyman-alpha radiation originating from the Milky Way galaxy. Lyman-alpha radiation had previously been detected from other galaxies, but because of interference from the Sun, the radiation from the Milky Way was not detectable. NASA announced on December 5, 2011, that Voyager 1 had entered a new region referred to as a "cosmic purgatory". Within this stagnation region, charged particles streaming from the Sun slow and turn inward, and the Solar System's magnetic field is doubled in strength as interstellar space appears to be applying pressure. Energetic particles originating in the Solar System decline by nearly half, while the detection of high-energy electrons from outside increases 100-fold. The inner edge of the stagnation region is located approximately 113 AU from the Sun. Heliopause NASA announced in June 2012 that the probe was detecting changes in the environment that were suspected to correlate with arrival at the heliopause. Voyager 1 had reported a marked increase in its detection of charged particles from interstellar space, which are normally deflected by the solar winds within the heliosphere from the Sun. The craft thus began to enter the interstellar medium at the edge of the Solar System. Voyager 1 became the first spacecraft to cross the heliopause in August 2012, then at a distance of from the Sun, although this was not confirmed for another year. As of September 2012, sunlight took 16.89 hours to get to Voyager 1 which was at a distance of 121 AU. The apparent magnitude of the Sun from the spacecraft was -16.3 (about 30 times brighter than the full Moon). The spacecraft was traveling at relative to the Sun. At this rate, it would need about 17,565 years at this speed to travel a single light-year. To compare, Proxima Centauri, the closest star to the Sun, is about 4.2 light-years () distant. If the spacecraft was traveling in the direction of that star, it would take 73,775 years to reach it. (Voyager 1 is heading in the direction of the constellation Ophiuchus.) In late 2012, researchers reported that particle data from the spacecraft suggested that the probe