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Roman's Neutron Star Hunt: Millions Hidden in the Milky Way
Audio is available on Spreaker — see link below.
NASA's Roman Space Telescope is set to detect millions of hidden neutron stars using gravitational microlensing — a capability nobody planned for. This episode breaks down the technique, the mass-gap mystery, and why Roman's precision changes everything.
Audio is available on Spreaker — see link below.
NASA's Roman Space Telescope hasn't launched yet, and it's already changing what we thought it could do. A study published today reveals that Roman will be capable of detecting millions of neutron stars hidden across the Milky Way, objects so dim and isolated that every other observatory has essentially missed them.
The technique is called gravitational microlensing. When a massive object passes in front of a distant background star, its gravity bends and briefly brightens that star's light.
Our galaxy is estimated to contain somewhere between ten and one hundred million neutron stars. We've catalogued only a few thousand, almost all of them pulsars or members of binary systems, objects that announce themselves through radio pulses or X-ray emissions.
One of the payoffs could be substantial. There's a long-standing question in astrophysics about whether a true mass gap exists between the heaviest neutron stars and the lightest black holes.
There's real uncertainty in the timeline. Roman's launch date hasn't been finalized, and the commissioning period adds further variables.
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