James Webb Space Telescope reveals rogue black hole and cold brown dwarf

Recent observations from the James Webb Space Telescope have provided significant insights into two distinct celestial phenomena.

Astronomers have confirmed the existence of a rogue, supermassive black hole traveling through space at approximately 1,000 kilometers per second. This object, likely displaced by a galactic merger, has left a trail of young stars spanning roughly 200,000 light-years. This stellar stream is twice the diameter of the Milky Way and contains enough new stars to equal half the brightness of the original galaxy.

Additionally, researchers led by Brittany Miles from the University of Arizona have studied WISE 0855, one of the coldest known brown dwarfs. With a temperature of approximately 265 Kelvin (-8 degrees Celsius), the object is best observed in the infrared spectrum. Data collected via the NIRSpec instrument suggests the presence of water ice clouds in its atmosphere, with the brown dwarf exhibiting a rotation period estimated between 5.4 and 5.6 hours.