GENERAL KNOWLEDGE

Detailed explanation-1: -This is called an open universe. If space has no curvature (i.e, it is flat), there is exactly enough mass to cause the expansion to stop, but only after an infinite amount of time.

Detailed explanation-2: -If the universe ever stops expanding and starts contracting again, it will go into something like the big bang in reverse-the big crunch-and bring time crashing to a halt. Time needn’t perish everywhere. Relativity says it expires inside black holes while carrying on in the universe at large.

Detailed explanation-3: -Observations suggest that the expansion of the universe will continue forever. The prevailing theory is that the universe will cool as it expands, eventually becoming too cold to sustain life. For this reason, this future scenario once popularly called “Heat Death” is now known as the “Big Chill” or “Big Freeze".