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Wandering black hole shreds star & ALMA expands high-frequency SETI search - Space News (Jul 31, 2026)
Published 1 day, 19 hours ago
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Episode Transcript
Wandering black hole shreds star
Our top story is a dramatic one: astronomers have analyzed a tidal disruption event caused by a supermassive black hole that appears to be wandering far from the center of its host galaxy. First flagged by the Zwicky Transient Facility and followed up by NASA's Swift mission, the flare came from a black hole about a million times the Sun's mass and more than 30,000 light-years off-center. That matters because supermassive black holes are usually expected to live in galactic nuclei, so this off-nuclear event could be evidence of past galaxy mergers, gravitational-wave recoil, or some other dynamical displacement.
ALMA expands high-frequency SETI search
Another intriguing late-July report comes from SETI research. Scientists used archival observations from ALMA in Chile to carry out a high-frequency search for narrowband signals that might indicate extraterrestrial technology. They did not find any candidate alien transmissions, but the bigger point is that this search explored millimeter and submillimeter wavelengths that traditional SETI programs often ignore. In other words, astronomers may have been listening to only part of the possible cosmic radio dial, and this work shows how existing observatory archives can expand that search efficiently.
New exoplanet methods gain momentum
Exoplanet science also had a notable update with Gaia23braL b entering the conversation as the first microlensing planet con
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Today's topics:
Wandering black hole shreds star - Astronomers analyzed a rare tidal disruption event from a supermassive black hole sitting far from its galaxy's center. The discovery could help reveal how wandering black holes are created by mergers, kicks, and galactic interactions.
ALMA expands high-frequency SETI search - A new study used archival ALMA data to search for technosignatures at millimeter wavelengths, an unusual region for SETI. No alien signals were found, but the work opens a largely unexplored part of the radio spectrum.
New exoplanet methods gain momentum - Late July brought a notable exoplanet update with Gaia23braL b, the first microlensing planet confirmed in TESS data. The story highlights how transit, microlensing, astrometry, and infrared imaging are increasingly working together.
Roman telescope nears August launch - NASA's Nancy Grace Roman Space Telescope is approaching its planned August 30 launch. Roman promises major advances in dark energy research, exoplanet microlensing, and wide-field infrared surveys.
Launches, astronauts, and skywatching ahead - The space operations beat stayed busy with the NROL-95 Falcon 9 launch, upcoming ISS activity, and NASA outreach on meteor showers and a total solar eclipse. These stories show how exploration, infrastructure, and public skywatching now move in parallel.
Episode Transcript
Wandering black hole shreds star
Our top story is a dramatic one: astronomers have analyzed a tidal disruption event caused by a supermassive black hole that appears to be wandering far from the center of its host galaxy. First flagged by the Zwicky Transient Facility and followed up by NASA's Swift mission, the flare came from a black hole about a million times the Sun's mass and more than 30,000 light-years off-center. That matters because supermassive black holes are usually expected to live in galactic nuclei, so this off-nuclear event could be evidence of past galaxy mergers, gravitational-wave recoil, or some other dynamical displacement.
ALMA expands high-frequency SETI search
Another intriguing late-July report comes from SETI research. Scientists used archival observations from ALMA in Chile to carry out a high-frequency search for narrowband signals that might indicate extraterrestrial technology. They did not find any candidate alien transmissions, but the bigger point is that this search explored millimeter and submillimeter wavelengths that traditional SETI programs often ignore. In other words, astronomers may have been listening to only part of the possible cosmic radio dial, and this work shows how existing observatory archives can expand that search efficiently.
New exoplanet methods gain momentum
Exoplanet science also had a notable update with Gaia23braL b entering the conversation as the first microlensing planet con