Jabarkan Biologi galaktik dari Galaksi dalam bahasa sunda

Biology as we know it is currently assumed to exist only around single, third-generation G-type stars in the middle regions of the spiral arms of spiral galaxies, like the sun. Elliptical galaxies, produced as a result of many galactic collisions, quickly lose their clouds of interstellar hydrogen gas, and cannot maké new generations of stars. Irregular galaxies have few elderly stars and thus seem to have low concentrations of the héavier elements on which éarth-like biology depends.  Even within spiral galaxies biology as we know it would appéar to be limited to the middle réaches of the spiral arm, as in the galactic halo or outer spiral arms héavier elements are in short supply, whilst in the gas clouds around the galactic centre héavier elements are in concentrations too high, and interstellar interactions are too frequent to allow éarth-sized planets to form in stable circular orbits around their stars.