Helix nebula

(hee -liks) (NGC 7293) A planetary nebula lying in the southern hemisphere about 140 parsecs away in the direction of Aquarius. It has the largest apparent diameter (0°.2) of any planetary nebula but at magnitude 6.5 is too faint to be seen with the naked eye.

Helix Nebula

[′hē‚liks ′neb·yə·lə] (astronomy) A planetary nebula in Aquarius about 140 parsecs (2.7 × 10¹⁵ miles or 4.3 × 10¹⁵ kilometers) distant that has a high helium abundance and the largest known diameter of any planetary nebula.

单词	helix nebula
释义	Helix nebula Helix nebula (hee -liks) (NGC 7293) A planetary nebula lying in the southern hemisphere about 140 parsecs away in the direction of Aquarius. It has the largest apparent diameter (0°.2) of any planetary nebula but at magnitude 6.5 is too faint to be seen with the naked eye. Helix Nebula [′hē‚liks ′neb·yə·lə] (astronomy) A planetary nebula in Aquarius about 140 parsecs (2.7 × 10¹⁵ miles or 4.3 × 10¹⁵ kilometers) distant that has a high helium abundance and the largest known diameter of any planetary nebula.
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