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Roman telescope hunts invisible neutron stars & Hubble spots galaxy mid-transformation - Space News (May 17, 2026)
Published 4 days, 7 hours ago
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Episode Transcript
Roman telescope hunts invisible neutron stars
Our first story stays in our own Milky Way, but focuses on some of the most elusive objects it contains.
Neutron stars are the ultra-dense corpses left behind when massive stars explode, but most of them are practically invisible: they don’t beam radio waves toward us like pulsars, and they don’t actively feed on a companion star, so there’s almost no light to give them away.
A new study out this weekend looks ahead to NASA’s Nancy Grace Roman Space Telescope and concludes that Roman could change that picture by detecting dozens of these otherwise hidden neutron stars through their gravity alone.
The key idea is gravitational microlensing, where a massive compact object drifts in front of a background star and briefly bends and magnifies its light.
Astronomers already use photometric microlensing, essentially watching for a temporary brightening of a star, to discover planets, black holes, and other dark objects.
What Roman brings to the table is a combination of extremely precise brightness measurements and extremely precise position measurements for millions of stars toward the crowded center of the Milky Way.
The simulations behind this new work suggest that, as a heavy lens passes in front of a background star, Roman will not only see the star brighten but also watch its apparent position shift ever so slightly on the sky.
Because neutron stars are much more massive than things like rogue planets or brown dwarfs, they produce a larger positional wobble, and that allows their mass to be measured rather than just inferred.
This matters for a couple of reasons.
First, astronomers know from theory and from supernova rates that the galaxy should be littered with hundreds of millions of neutron stars, but only a small fraction have been detected as pulsars or X-ray sources.
If Roman ca
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Today's topics:
Roman telescope hunts invisible neutron stars - A new study shows NASA's Nancy Grace Roman Space Telescope could uncover a vast hidden population of isolated neutron stars using gravitational microlensing, offering the first large-scale census of these dark stellar remnants and precise mass measurements. Keywords: Roman Space Telescope, neutron stars, microlensing, stellar remnants, Milky Way.
Hubble spots galaxy mid-transformation - Fresh Hubble observations of the galaxy NGC 1266 reveal a rare post-starburst system where a central black hole appears to be shutting down star formation, catching a galaxy in the act of transforming from blue and star-forming to red and quiescent. Keywords: Hubble Space Telescope, NGC 1266, galaxy evolution, black hole feedback, post-starburst.
SpaceX Dragon CRS-34 docks with ISS - SpaceX's uncrewed Dragon cargo ship on the CRS-34 mission has arrived at the International Space Station with about 6,500 pounds of supplies and experiments, reinforcing the station's role as an orbiting laboratory for biology, materials science, and space weather research. Keywords: SpaceX Dragon, CRS-34, International Space Station, cargo resupply, microgravity experiments.
Episode Transcript
Roman telescope hunts invisible neutron stars
Our first story stays in our own Milky Way, but focuses on some of the most elusive objects it contains.
Neutron stars are the ultra-dense corpses left behind when massive stars explode, but most of them are practically invisible: they don’t beam radio waves toward us like pulsars, and they don’t actively feed on a companion star, so there’s almost no light to give them away.
A new study out this weekend looks ahead to NASA’s Nancy Grace Roman Space Telescope and concludes that Roman could change that picture by detecting dozens of these otherwise hidden neutron stars through their gravity alone.
The key idea is gravitational microlensing, where a massive compact object drifts in front of a background star and briefly bends and magnifies its light.
Astronomers already use photometric microlensing, essentially watching for a temporary brightening of a star, to discover planets, black holes, and other dark objects.
What Roman brings to the table is a combination of extremely precise brightness measurements and extremely precise position measurements for millions of stars toward the crowded center of the Milky Way.
The simulations behind this new work suggest that, as a heavy lens passes in front of a background star, Roman will not only see the star brighten but also watch its apparent position shift ever so slightly on the sky.
Because neutron stars are much more massive than things like rogue planets or brown dwarfs, they produce a larger positional wobble, and that allows their mass to be measured rather than just inferred.
This matters for a couple of reasons.
First, astronomers know from theory and from supernova rates that the galaxy should be littered with hundreds of millions of neutron stars, but only a small fraction have been detected as pulsars or X-ray sources.
If Roman ca