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The bright initial flash of a nuclear weapon is the first indication of a nuclear explosion, traveling faster than the blast wave or sound wave. [6] "A 1-megaton explosion can cause flash blindness at distances as great as 13 miles (21 km) on a clear day, or 53 miles (85 km) on a clear night.
"Glow in the dark" and its derivative terms have been used to refer to various groups: newcomers that do not fit in with the culture of certain forums and are thus suspected to have bad intentions, journalists who report on extremist groups, tech companies that collect users' personal data, and others. [1] [5] [6] [7] G-man, Government-man, G-woman
Post tenebras lux is a Latin phrase translated as Light After Darkness. It appears as Post tenebras spero lucem ("After darkness, I hope for light") in the Vulgate version of Job 17:12. [1] Post Tenebras Lux in the seal of the Canton of Geneva
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a ...
This is a list of acronyms, expressions, euphemisms, jargon, military slang, and sayings in common or formerly common use in the United States Marine Corps.Many of the words or phrases have varying levels of acceptance among different units or communities, and some also have varying levels of appropriateness (usually dependent on how senior the user is in rank [clarification needed]).
Pressure phosphenes can persist briefly after the rubbing stops and the eyes are opened, allowing the phosphenes to be seen on the visual scene. Hermann von Helmholtz and others have published drawings of their pressure phosphenes. One example of a pressure phosphene is demonstrated by gently pressing the side of one's eye and observing a ...
Civil, nautical, and astronomical twilight. [3] Dusk is the darkest part of evening twilight. The time of dusk is the moment at the very end of astronomical twilight, just before the minimum brightness of the night sky sets in, or may be thought of as the darkest part of evening twilight. [4]
BCD – (software) Basic calibrated data, data produced after basic processing; BCEP – (celestial object) Beta CEPhei, a class of pulsating variable stars for which Beta Cephei is the archetypal object. also BCE; BCG – (celestial object) Blue compact galaxy, another name for a blue compact dwarf, also bright central galaxy