Physics
The earth is a

Non-absorber of heat
Good reflector of heat
Good absorber and good radiator of heat
Bad absorber and bad radiator of heat

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

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

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