Eating habits and lifestyle choices arenât the only possible causes of indigestion. Sometimes, symptoms of indigestion indicate a serious problem in the upper digestive tract. Common digestive diseases that can cause indigestion include: acid reflux disease (also called GERD)
Define accretion disk: a disk of usually gaseous matter surrounding a massive celestial object (such as a black hole) in which the matter graduallyâ¦ a disk of usually gaseous matter surrounding a massive celestial object (such as a black hole) in which the matter gradually spirals in towardâ¦
Two major places where astronomers see accretion disks are in binary star systems (two stars orbiting each other) and active galactic nuclei. I will discuss an accretion disk in a binary star system, but the basic ideas are the same for all cases. If one star in a binary system is a compact object such as a very dense white dwarf star and the other star is a normal star like the Sun, the white dwarf can pull gas off the normal star and accrete it onto itself.