It's impossible to definitively rank the "most famous" physicists as fame is subjective and can vary based on time period, cultural context, and individual perspectives. However, here are ten physicists who are widely recognized for their groundbreaking contributions and influence on the field:

1. Albert Einstein: Known for his theories of relativity, E=mc², and the photoelectric effect, Einstein revolutionized our understanding of space, time, gravity, and the nature of light. He is arguably the most famous scientist of all time.

2. Isaac Newton: Developed the laws of motion and universal gravitation, laying the foundation for classical mechanics and modern physics. His work on optics and calculus was also groundbreaking.

3. Marie Curie: Pioneer in radioactivity, the first woman to win a Nobel Prize, and the only person to win Nobel Prizes in two different scientific fields (physics and chemistry). Her work led to advancements in medicine and nuclear energy.

4. Niels Bohr: Developed the Bohr model of the atom, explaining the structure of the atom and the nature of light emission. He played a significant role in the development of quantum mechanics.

5. Richard Feynman: Known for his work on quantum electrodynamics (QED), his unique approach to teaching, and his playful personality. Feynman diagrams are a fundamental tool in modern physics.

6. Stephen Hawking: Theoretical physicist and cosmologist known for his work on black holes, singularity theorems, and the Big Bang. He wrote popular books that brought complex physics concepts to the public.

7. Erwin Schrödinger: One of the founders of quantum mechanics, known for his wave equation describing the behavior of electrons in atoms.

8. Werner Heisenberg: Developed matrix mechanics, one of the foundations of quantum mechanics. He is also known for the Heisenberg uncertainty principle.

9. Galileo Galilei: Made fundamental contributions to astronomy, physics, and the scientific method. He improved the telescope, observed the phases of Venus, and defended the heliocentric model of the solar system.

10. Max Planck: Founder of quantum theory, proposing that energy is emitted and absorbed in discrete units called quanta. This revolutionary idea laid the groundwork for modern physics.

This list is not exhaustive, and many other physicists deserve recognition for their contributions to our understanding of the universe. It's important to remember that fame is not the sole measure of a scientist's impact; their contributions to scientific knowledge and the advancement of human understanding are what truly matter.