After monitoring stellar orbits around Sagittarius A* (the supermassive black hole in center of the Milky Way) for 16 years, scientists estimate the object's mass at 4.31 million solar masses.
Like ballerinas pirouetting around an invisible leader, a collection of stars orbits our galaxy's gravity sink, or black hole. New infrared images of the cosmic dance confirm that this supermassive black hole weighs as much as 4 million suns.
Sagittarius A*, a compact radio source at the center of the Milky Way, is proved to be a supermassive black hole. 2005-11-3 (Context: Milky Way, Sagittarius A*, supermassive black hole)
Scientists using data from the Chandra X-ray Observatory discover new exoplanets in galaxies beyond the Milky Way for the first time. 2018-02-5 (Context: Milky Way)
A study published in "Nature" and the "Astrophysical Journal Letters" describes the discovery of the most distant supermassive black hole ever, around 13.1 billion light years away. 2017-12-6 (Context: supermassive black hole)
Astronomers say they have observed bizarre light patterns using the Kepler Space Telescope from a star that appears old, but is shrouded in debris like a much younger star, roughly 1,500 light-years away. This has led to speculation that these are an "artificial extraterrestrial mega-structure", orbiting the star known as KIC 8462852 in the Cygnus constellation. KIC 8462852 lies just above the Milky Way between the constellations Cygnus and Lyra. It first attracted the attention of astronomers in 2009 when the Kepler Space Telescope identified it as a candidate for having orbiting Earth-like planets. 2015-10-15 (Context: Milky Way)
Ultracompact dwarf galaxy M60-UCD1 is revealed to be the smallest known galaxy to have a supermassive black hole at its centre. 2014-09-18 (Context: supermassive black hole)