Zero-gravity indicator
Small object used to demonstrate apparent weightlessness in space travel
Zero-gravity indicator
Zero-gravity indicators, also known as free-fall indicators, are small objects carried aboard spacecraft and released inside the crew cabin to provide a visual confirmation that the vehicle has entered a microgravity environment. When the spacecraft reaches sustained free fall, the object floats freely, making the transition to weightlessness visible to the crew and, in some cases, to observers via onboard video.
Read on Wikipedia · Image NASA, Public domain
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