) Not young; advanced far in years or life; having lived till toward the end of the ordinary term of living; as, an old man; an old age; an old horse; an old tree. Old (superl.) Not new or fresh; not recently made or produced; having existed for a long time; as, old wine;...
A hospitable star that doesn't kill you with deadly flares. A rocky planet with liquid water and an agreeable climate. Absence of apocalyptic asteroid storms. No pantheon of angry, vengeful and capricious gods. These are the things that define a habitable planet. Now, some scientists are addin...