What is the main idea of this selection?
A Mass is an important dimension of stars and galaxies in the universe.
B The dimension of time is an absolute similar to the speed of light.
C Einstein’s theory of general relativity is based on Newton’s laws of motion.
D Space and time are part of a single entity that can be bent by objects and light.
Understanding the Main Idea of the Selection
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The correct answer is: D Space and time are part of a single entity that can be bent by objects and light.
Explanation: The main idea revolves around Einstein’s theory of relativity, which posits that space and time are interconnected (often referred to as spacetime) and can be influenced by mass and energy. This principle indicates that massive objects can curve spacetime, affecting the movement of other objects and light in their vicinity.