Physics
The large collection of stars, dust and gas held together by gravitational attraction between components is known as

Sun Family
Atmosphere
Galaxy
Cluster

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The density of sea water is lesser than the density of river water
The sea is-deeper than the river
The density of sea water is more than the density of river water

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