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The relativistic pulsar-white dwarf binary PSR J1738+0333 II. The most stringent test of scalar-tensor gravity
http://arxiv.org/abs/1205.1450
http://arxiv.org/abs/1205.1450
MOND stands for Modified Newtonian Dynamics, a theory proposed as an alternative to dark matter to explain the observed discrepancies in the rotation curves of galaxies.
The phrase "nail in the coffin" is often used to refer to evidence that disproves or heavily challenges a theory. In this case, "Another nail in the MOND coffin" refers to new evidence or findings that further weaken the plausibility of MOND as a viable theory.
There have been several recent studies and observations that have challenged the predictions of MOND, such as the observed gravitational lensing effects in galaxy clusters and the distribution of matter in the cosmic microwave background.
No, while there is strong evidence against MOND, it cannot be completely ruled out as a valid theory. There are still ongoing debates and research surrounding the theory, and it is possible that future evidence or refinements to the theory may support its validity.
Aside from MOND and dark matter, there are also other theories being explored, such as modified gravity and the existence of exotic particles. However, currently, dark matter remains the most widely accepted explanation for the observed discrepancies in galaxy rotation curves.