[2026] PTE Academic Reading - Multiple Choice, Single Answer

For nearly a century, the enigma of dark matter has haunted the field of astrophysics, serving as a reminder of the vast invisibility that anchors our universe. While it constitutes approximately 85% of all matter, its presence is inferred purely through gravitational effects on visible stars and galaxies rather than direct detection. Critics of the current cosmological model argue that dark matter may be a modern 'epicycle'—a theoretical patch used to sustain a flawed understanding of gravity. They suggest that instead of inventing unseen particles, we should perhaps reconsider the fundamental laws of Newtonian and Einsteinian physics. However, the majority of the scientific community maintains that the overwhelming indirect evidence justifies the continued search for a physical particle. To abandon the hypothesis now would be to ignore the mathematical elegance that the dark matter framework provides to our observations of the cosmic microwave background. Ultimately, the pursuit of dark matter illustrates a profound philosophical tension in science: the struggle between the empiricist’s need for tangible proof and the theorist’s reliance on predictive consistency. Whether it is a physical reality or a mathematical ghost, the resolution of this mystery will likely redefine our conception of the vacuum itself.