Apparently all living things emit an eerie glow that is snuffed out upon death. Presumably this also applies to deep-sea creatures that otherwise live in total darkness( 17 May, p 11 ).

Related: Extremely rare, black 'anti-auroras' paint luminous 'letter E' above Alaska. ... As that happens, the molecules give off the mesmerizing glow we can observe on Earth as the auroras.

Scientists climbed 60-meter Amazon trees and discovered that the forest's glow visible from satellites can be misleading.

The Earth Observatory describes the feature as “one of the most recognizable points on the planet” for astronauts gazing down at Earth. NASA/Earth Observatory/Scott Kelly 11.

To the editor — Our Earth is a living being. ... Letters have a firm 200-word limit and will be edited for grammar, clarity and accuracy. The person who signs the letter must be the author.