Quantum mechanics challenges previous understanding of the universe’s origins.

Evidence

the singularity theorems really show is that there must have been a time in the very early universe when the universe was so small that one could no longer ignore the small-scale effects of the other great partial theory of the twentieth century, quantum mechanics. — Hawking, Stephen, A Brief History of Time, 101

Categorization

• corroborated: 2 independent passages support this claim — Hawking, Stephen, A Brief History of Time, 101
• XREF: connects to: Quantum uncertainty drives the early universe’s non-uniformity. — Hawking, Stephen, A Brief History of Time, 247; The existence of the universe raises questions about its origin. — Hawking, Stephen, A Brief History of Time, 341; Quantum mechanics is one of science’s most successful theories yet remains profoundly counterintuitive and resists intuitive sense-making. — Quantum Mechanics and the Limits of Human Intuition