Directions: read the following passage and answer the questions.
Passage:
Title: "The Enigma of Dark Matter"
In the cosmic tapestry, there exists an enigmatic force that eludes direct observation yet exerts a profound influence on the universe's very fabric. This elusive phenomenon is known as dark matter.
Dark matter, unlike its luminous counterpart, does not emit, absorb, or reflect light. It defies detection by conventional means, making its presence known solely through its gravitational effects. Its mysterious nature has intrigued scientists and cosmologists for decades, driving a quest to unravel its secrets.
The prevailing hypothesis suggests that dark matter constitutes a significant portion of the universe's mass. It is believed to be the gravitational glue that binds galaxies together, preventing their stars from spiralling away into the void. Through meticulous observations of galactic rotations and gravitational lensing, scientists have inferred the presence of this unseen force.
Yet, the nature of dark matter remains shrouded in uncertainty. Is it composed of exotic particles, undetectable by current technology? Or does it signal a modification of the laws of gravity on cosmic scales? These are questions that continue to challenge the forefront of astrophysical research.
The quest to unveil the enigma of dark matter represents not only a scientific endeavour but a philosophical one. It underscores humanity's unyielding curiosity about the mysteries of the cosmos and the relentless pursuit of knowledge that defines our species.
What is the main theme of the passage
The nature of dark matter and its composition
The enigma of dark matter and the quest to understand it
The gravitational effects of dark matter on galaxies
The philosophical implications of dark matter research
The main theme of the passage is the enigma of dark matter and the quest to understand this elusive phenomenon.