| 单词 | hubble's variable nebula |
| 释义 | Hubble's variable nebulaHubble's variable nebula(NGC 2261) A fan-shaped reflection nebula in the constellation Monoceros that is illuminated by the variable star R Monocerotis. R Mon, an infrared source, is a very young stellar object surrounded by a disk of dust and ejecting a bipolar outflow; this causes the brightness and outline of the nebula to vary. The nebula is a Herbig–Haro object. It takes its name from the great US astronomer Edwin Hubble, who first noticed its variability.Hubble's Variable Nebula[′həb·əlz ¦ver·ē·ə·bəl ′neb·yə·lə] |
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