english: Alkanes form a significant portion of the atmospheres of the outer gas planets such as Jupiter (0.1% methane, 0.0002% ethane), Saturn (0.2% methane, 0.0005% ethane), Uranus (1.99% methane, 0.00025% ethane) and Neptune (1.5% methane, 1.5 ppm ethane).
non_english: Alkana arupa senyawa kang ana ing pérangan cilik saka atsmofèr sapérangan planit kaya ta Yupiter (0.1% metana, 0.0002% etana), Saturnus (0.2% metana, 0.0005% etana), Uranus (1.99% metana, 0.00025% etana) lan Neptunus (1.5% metana, 1.5 ppm etana).