Physics
'Parsec' is the unit measurement of

Density of stars
Orbital velocity of giant stars
Astronomical distance
Brightness of heavenly bodies

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Physics
Which of the following options correctly explains the term heat budget?

It is the radiation from the earth in the form of long waves.
It is the amount of heat which the surface of earth receives from the sun.
It is the balance between incoming and outgoing radiation
It is a mode of transfer of heat through matter by molecular activity.

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