
ALT A composite NASA Chandra X-ray and Sloan Digital Sky Survey (SDSS) optical image of the galaxy NGC 4559 located about 30 million light-years from Earth. The Chandra data shows X-ray point sources represented in purple, and the SDSS data shows the galaxy and foreground and background objects in red and blue. The luminous blue variable and supernova impostor AT 2016blu is in the middle of the small square. X-ray: NASA/CXC/Univ. of Virgina/M. Aghakhanloo et al.; Optical: SDSS; Image Processing: NASA/CXC/SAO/P. Edmonds

ALT A composite image of a small portion of the Carina Nebula reveals a striking golden-orange cloud of gas and dust that loosely resembles a ghostly figure. Its glowing hooded head and a sweeping cape-like tail stretch through a star-filled background of rich blues, reds, and greens. Brilliant blue-white stars sparkle in the scene, while bright pink dots of X-ray light reveal young stars scattered across this eerie stellar nursery. Credit: X-ray: NASA/CXC/SAO; Optical: CTIO/NOIRLab/NSF/AURA/N.Smith(Univ of Minnesota); Infrared: NASA/ESA/CSA/STScI; Image Processing: NASA/CXC/SAO/L. Frattare

ALT Against a black background, a ghostly, blue silhouette takes shape amongst white, yellow, blue, and orange twinkling stars. The glowing apparition comes to a point in the top right of the frame, and rounded recesses just below resemble a brow, eyes, and an open mouth. The blue phantom emits a subtle red glow. Credit: NASA/ESA, and STScI/Acknowledgment: H. Arab (University of Strasbourg)


























