... Abell 1689 Warps Space . ... Two billion light-years away, galaxy cluster Abell 1689 is one of the most massive objects in the Universe. ... Using the orbiting Chandra X-ray Observatory, astronomers have taken this long look at the core of our Milky Way galaxy, some 26,000 light-years away. ... Open Star Cluster M38 . ... Over 10,000 stars are visible -- the brightest of which are giant stars. Were our Sun at the distance of these stars, about 170,000 light-years, it would hardly be discernable. ...