Dark matter is only known by its effect on massive astronomical bodies, but has yet to be directly observed or even identified. A theory about what dark matter might be suggests that it could be a particle called an axion and that these could be detectable with laser-based experiments that already exist. These laser experiments are gravitational-wave observatories.

Physicists and computer scientists have developed a new approach to the problem of dark matter and dark energy in the universe. Using machine learning tools, they programmed computers to teach themselves how to extract the relevant information from maps of the universe.

New research by astrophysicists reveals how the gas and energy expelled by stars are returned to the universe, and in what forms. It also found that the elements produced by dying stars are transferred through a process of fragmentation and recycled into new stars and planets.

For decades, physicists have been attempting to reconcile quantum mechanics, the physics of the very small, with gravity, the physics of the very large. While many academics are working on quantum gravity, they often use models that don't consider certain aspects of our own universe, like its accelerated expansion. A team reports a new approach to quantum gravity using a model that more closely matches our reality.

The origin of matter remains a complex and open question. A novel experimental approach could be exploited to better test the theories of physicists.