An advanced civilization lives on a planet orbiting a close binary star system that consists of a 15msun red giant and a 10msun black hole. assume that the two stars are quite close together, so that an accretion disk surrounds the black hole. the planet on which the civilization lives orbits the binary star at a distance of 10 au.
sometime within the next million years or so, their planet is likely to be doomed because

Because the red giant is likely to blow into a supernova within the next million years.

Explanation:

A red giant is one of the final phases of a dying star. Usually, in small stars such as our sun, the cycle would end with the star as a white dwarf.  The star will start to blow out the outer layers of the star in enormous clouds of gas and stellar dust that are known as a planetary Nebulae, as the core continues to collapse itself, it will end its life as a white dwarf.

But in this case, we have a massive star, since it has a larger mass, this will start to fall inwards until the gas and dust will be blown off in a strong explosion called a supernova. The fact that the black hole is so close to the star will only speed up the process, as will destabilize the core faster, and soon, this advanced civilization will have serious habitability issues with their planet.

hi there,

on december 11, 2001, china officially became the 143rd member of the

world trade organization (wto) in the culmination of a negotiation

process which began in 1986. economists have long been debating the

global effects of china's accession to the wto, and as china becomes

fully integrated into the organization over the next several years,

the accuracy of their predictions will be tested.

one of the biggest residual effects of china's entry to the wto,

according to economists, will be the relocation of manufacturing and

distribution centers to china. due to its cheap labor, cheap

industrial land, and educated workforce, china is an ideal production

centre for businesses based in outside countries. this will likely

result in a twofold impact – more jobs will be available in china,

while countries like india, which have historically offered cheap

labor, will suffer. taiwan and malaysia's technology industries are

already suffering as companies like dell computers move production to

china, and while foreign investment soars in china, other asian

countries suffer. in addition, mexico and the caribbean will lose

thousands of garment manufacturing jobs as the u.s. lifts restraints

on chinese textile imports.

while the impact on southeast asia may be negative, the western world

may benefit. while some suggest china's open borders will result in

increased competition and a decreased employment rate for the western

world, western countries will benefit from access to china's highly

developed electronics and industry sectors. with duties and quotas

slashed, and restrictions lifted, multinationals will benefit by

setting up distribution centers without the need for chinese

middlemen. in addition, it's expected that china will import massive

amounts of food products, machinery and vehicles from the u.s., japan,

hong kong, taiwan, singapore and south korea, thus providing

significant boosts to these countries' economies.

in conclusion, it seems that while western countries may benefit from

china's accession to the wto, there's the potential that asian and

south american countries may feel the pinch of free trade as china

moves to a global economy.