I found an article titled, “Dying star May Transform Frozen World Into Haven For life“. When most stars reach old age and begin to run out of fuel, they swell up to hundreds of times their normal size, engulfing planets that orbit too close. But can planets that escape fiery demise still support life? In this state, can planets around the dying star host life? New research says yes. In about 1.5 billion years, the will have begun its march to the grave and it will start expanding. Eventually it will swell to about 200 times its current size. It will swallow Mercury and Venus, and make Earth uninhabitable. Many stars in the universe become a red giant, and can remain that way for billions of year. The new work provides an in-depth look at how long planets can remain habitable around red giants in some cases, for up to nine billion years, which is twice Earths current age. A stars luminosity, or the total amount of light it emits and gives in a given time, is largely responsible for defining the habitable zone. As a star swells up into a red giant, its luminosity increases. Stars lose mass when they become red giants, and that mass gets blasted outward, as part of the so-called stellar wind. The new work shows that some planets will lose their atmosphere during the evolution … those located very close to the star, and those with low gravity.
The fourteenth conceptual objective is, I can describe how stars evolve and die. After many years helium collects to each other in space called helium ash. Then the helium core is compressed together, electrons have fewer places to go, which degenerate pressure results into electron degeneracy. Which causes a helium flash, which is when the care reaches 100MK, helium can begin to fuse. Which the creates a supernova. Which creates a neutron star which has three components. First the massive star is dense and has a hot core. Next a supernova explosion blows off outer layers. And finally the supernova expands forever. After this process the mass of the core is classified into three groups. Anything more the 1.4 of the sun becomes a white dwarf. secondly. and thing largest the 3.0 is a neutron stars. And finally anything less the 3.0, gravity overcomes degenerate pressure. We did a lecture tutorial about called stellar evolution. which thought us which path a star can tale after becoming a red giant. If it has smaller mass of 8Ms it becomes a planetary nebula leaving behind a white dwarf. And if the mass is large of 8Ms it becomes a type II supernova leaving behind either a neural star or black hole.
This article relates to what we did in class because we talked about how the sun is a star, along with how it dies every day. But we will not see this in our lifetime. It also explained how a star is evolving and can eventually die. The lecture tutorial showed use what happens in the finally stages of a stare evolving as well as dyeing.