Biosphere
That part of the earth and its atmosphere in which animal and plants live.
Blackout
1. A fadeout of radio communications due to environmental factors such as ionospheric disturbances, or a plasma sheath surrounding a reentry vehicle.
2. A condition in which vision is temporarily obscured by a blackness, accompanied by a dullness of certain other senses, brought on by decreased blood pressure in the head and a consequent lack of oxygen, as may occur in any high g-force condition.
Blip
A spot of light or other indicator on a radar scope (cathode-ray tube).
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