GENERAL KNOWLEDGE

Detailed explanation-1: -Dark Energy is a hypothetical form of energy that exerts a negative, repulsive pressure, behaving like the opposite of gravity. It has been hypothesised to account for the observational properties of distant type Ia supernovae, which show the universe going through an accelerated period of expansion.

Detailed explanation-2: -Dark energy is caused by energy inherent to the fabric of space itself, and as the Universe expands, it’s the energy density-the energy-per-unit-volume-that remains constant. As a result, a Universe filled with dark energy will see its expansion rate remain constant, rather than drop at all.

Detailed explanation-3: -But it isn’t. It’s accelerating, and the term “dark energy” is a placeholder for the mysterious force driving this acceleration. As a result, dark energy is, in effect, working against the force of gravity-pushing cosmic objects apart as gravity draws them together.

Detailed explanation-4: -Known as “quintessence, ‘’ this form of dark energy would vary in space and time, thus providing a possible way to distinguish it from a cosmological constant. It is also similar in mechanism (though vastly different in scale) to the scalar field energy invoked in the inflationary theory of the big bang.