During the last few decades, we've begun to glimpse the universe not just with photons, but also with other messengers like cosmic rays, neutrinos, and even gravitational waves. I will show why photons, cosmic rays, and neutrinos are fundamentally interconnected—as dark matter may also be—and why very-high-energy gamma rays are a key domain in

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X-ray binaries (XRBs) are binary systems where a compact object, either a black hole or a neutron star, accretes matter from a stellar companion via an accretion disc. As this material spirals in, it heats up and emits X-rays, typically exhibiting transient outburst behaviour.During these outbursts, XRBs often transition between hard states