One sign that a planet probably already contains life is the presence of an atmosphere with significant amounts of oxygen, since that gas is highly reactive and generally would not last long without constant replenishment.
Silih tunggih tanda indik asiki planet minab sampun madaging kahuripan inggih punika kawéntenan atmosfer antuk akéhnyané oksigen sané signifikan, santuka gas punika reaktif pisan miwah katahnyané nénten prasida ajeg tan panagingin ulang sané konstan.