Flexi Says: The location of the habitable zone depends on the brightness of the star. For fainter stars, the habitable zone moves closer in and for brighter stars, the habitable zone moves farther out. In addition, the lifetime of the star depends on its mass. Faint, low-mass stars live for a few hundred billion years while the lifetime of bright, massive stars is only millions of years long. According to these calculations, Earth can support life till it remains in the habitable zone. The habitable lifetime for Earth is predicted to be about 6.3 billion–7.8 billion years and it will be habitable for somewhere between 1.75 billion and 3.15 billion more years.