NASA Roman Telescope to Search for Hidden Neutron Stars

NASA scientists will use the Nancy Grace Roman Space Telescope to detect isolated neutron stars by measuring gravitational microlensing [1, 2].

This mission aims to uncover a hidden population of extreme objects that are otherwise invisible to traditional telescopes. By identifying these stars, researchers can better understand how neutron stars form and how they attain high velocities as they move through the galaxy [1, 3].

The telescope will identify these objects by monitoring the light-bending and positional shifts of background stars [1, 2]. This process, known as gravitational microlensing, occurs when the gravity of a foreground object acts as a lens, magnifying the light of a distant star behind it.

Estimates regarding the potential discoveries vary across reports. Some data suggests the telescope could reveal millions of invisible neutron stars ^[1], while other reports indicate it may unlock dozens of such objects ^[2].

NASA intends to use these observations to measure the masses of the detected stars [1, 3]. This data is critical for astrophysicists seeking to map the distribution of dense matter in the Milky Way, and refine models of stellar evolution.

The search focuses on isolated neutron stars, which are more difficult to find than those in binary systems. Because they do not emit the consistent pulses of pulsars or the bright X-rays of accreting systems, they often remain undetected by current instruments [1, 3].