| oort cloud | (n) (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun |
| オールトの雲 | [オールトのくも, o-ruto nokumo] (n) Oort cloud [Add to Longdo] |
| オールト雲 | [オールトうん, o-ruto un] (n) (See オールトの雲) Oort cloud [Add to Longdo] |