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Cosmic noise, also known as galactic radio noise, is a physical phenomenon derived from outside of the Earth's atmosphere. It is not actually sound, and it can be detected through a radio receiver , which is an electronic device that receives radio waves and converts the information given by them to an audible form.
The name was given because the sound slowly decreases in frequency over about seven minutes. It was recorded using an autonomous hydrophone array. [8] The sound has been picked up several times each year since 1997. [9] One of the hypotheses on the origin of the sound is moving ice in Antarctica. Sound spectrograms of vibrations caused by ...
Airglow over Auvergne, France Yellow, green and red bands of airglow along Earth's limb as seen from space. Airglow (also called nightglow ) is a faint emission of light by a planetary atmosphere . In the case of Earth's atmosphere , this optical phenomenon causes the night sky never to be completely dark, even after the effects of starlight ...
Since this still lacks scientific confirmation, rampant speculation continues about potential extra-terrestrial theories for these "trumpet noises." But don't count NASA as a UFO-doubter just yet.
Day-night average level, DNL or LDN: This measurement assesses the cumulative exposure to sound for a 24-hour period (L eq over 24 hrs) of the year, with a 10 dB(A) penalty or weight added to nighttime noise measurements given the increased sensitivity to noise at night.
Why does it get harder to drive at night as you age and what can you do about it? Here are some expert tips. ... While it may sound surprising, vision changes that affect nighttime driving can ...
Download QR code; Print/export Download as PDF; ... move to sidebar hide. Driving at Night may refer to: "Driving at Night", a song in the musical State ...
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