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The idea that space and time form a four-dimensional continuum was first suggested by Hermann Minkowski as a natural consequence of Einstein's Special Theory of Relativity. In this framework, time is not an independent, absolute entity, as Newton had assumed, but rather interwoven with the three spatial dimensions into a single fabric known as space-time. Events occur at points in this space-time, and their separation is governed not by traditional Euclidean distance but by the relativistic interval, which remains invariant under changes of reference frame. This deep connection between space and time implies that the passage of time is not universal but relative: what one observer perceives as simultaneous may differ for another observer in relative motion.

This concept becomes even more profound when we introduce gravity, as formulated in Einstein's General Theory of Relativity. Gravity is no longer thought of as a force in the Newtonian sense but rather as the curvature of space-time caused by the presence of mass and energy. Objects moving within this curved space-time follow geodesics—the natural paths dictated by the warping of space and time itself. This leads to the astonishing prediction that time runs differently in regions of varying gravitational potential: near a massive body, such as a black hole, time slows relative to an observer in free space. This effect, known as gravitational time dilation, has been confirmed through precise experiments, such as the observation that clocks aboard satellites tick slightly faster than those on Earth's surface due to weaker gravity.

Which of the following best describes the grammatical structure of the sentence:

"This deep connection between space and time implies that the passage of time is not universal but relative:"?

This question was previously asked in
SSC Selection Post 2025 Graduate Level Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

Complex sentence

A simple sentence has one independent clause; a compound sentence joins two or more independent clauses with a coordinating conjunction; a complex sentence has one independent clause plus at least one dependent (subordinate) clause; a compound-complex sentence has two or more independent clauses and at least one dependent clause.

Main (independent) clause: "This deep connection between space and time implies ..." — subject "This deep connection", verb "implies".

Dependent clause: "that the passage of time is not universal but relative" — a noun clause introduced by "that", acting as the object of "implies". It cannot stand on its own as a sentence.

"not universal but relative" only links two adjectives (complements); it does not join two independent clauses, so the sentence is not compound.

One independent clause + one dependent noun clause = a complex sentence.

Hence, the answer is Complex sentence.

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