From - Sky & Telescope By - Colin Stuart Edited by - Amal Udawatta Constant Contact Use. Please leave this field blank. False-color views of the face-on circumstellar disk around Vega from the Hubble (left) and Webb (right) space telescopes. In both images, light from the star itself has been subtracted to create the dark spot at the center. The disk is very smooth, with no evidence of embedded large planets. NASA / ESA / CSA / STScI / S. Wolff, K. Su, A. Gáspár (University of Arizona) Vega, the stellar standout of the constellation Lyra, the Lyre, has long intrigued astronomers. It is one of the brightest stars in the sky, and the glow of all other is measured against it. To say that the circumstellar disk around Vega is vast would be an understatement — it spans about 100 billion miles. That’s more than 1,000 times Earth’s distance from the Sun. High-resolution images reveal the debris disk around Lyra’s brightest star to be exceedingly smooth. If any planets lurk therein, they
From - Sky & Telescope Camille M. Carlisle By - Camille M. Carlisel Edited by Amal Udawatta Constant Contact Use. Please leave this field blank. Artist's concept of the V404 Cygni system, in which a black hole is stealing gas from a nearby star. Astronomers had thought the system was only a binary, but a second star (upper white flash) orbits at a much farther distance. Jorge Lugo The system V404 Cygni is an old favorite with astronomers. The binary contains a 9-solar-mass black hole that’s slurping gas from a star slightly less massive than the Sun. Astronomically speaking, only a hair’s breath separates the pair: 0.14 astronomical unit, or less than half Mercury’s average distance from the Sun. (This is normal for these kinds of systems.) The hot gas swirling down onto the black hole creates an X-ray beacon. In fact, V404 Cygni was the first system of its kind — called a low-mass X-ray binary , or LMXB, where the “low mass” refers to the companion star — that astronome