Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Absence of gravity outside
Fact that spacecraft in the orbit has no energy
Presence of gravity outside but not inside the spacecraft
Acceleration in the orbit which is equal to the acceleration due to gravity outside

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