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NASA's Roman Space Telescope could reveal black holes ripping up stars. It's set to launch Aug. 30
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NASA's upcoming Nancy Grace Roman Space Telescope, scheduled to launch on August 30, 2026, is poised to revolutionize the study of tidal disruption events (TDEs)—cosmic phenomena where supermassive black holes rip stars apart. These violent events occur when a star ventures too close to a black hole, undergoing 'spaghettification' as its plasma wraps around the black hole and is gradually consumed. Because black holes are invisible behind their event horizons, TDEs provide rare opportunities to study them by illuminating their feeding processes.
TDEs are particularly valuable for investigating lighter supermassive black holes, which are otherwise hard to detect due to their low activity. These events can outshine the combined light of their host galaxy, making them visible across vast distances. Previous research suggested that TDEs were rare in the early universe because early black holes were too small to shred stars. However, a new study reassessing the frequency of TDEs around 1 to 2 billion years after the Big Bang indicates they may have been more common, especially during the dense conditions of 'cosmic noon'—a period 11 to 12 billion years ago.
Roman's High-Latitude Time-Domain Survey will repeatedly observe a sky area equivalent to 90 full moons, searching for transient events like TDEs. The study estimates that Roman will detect thousands to tens of thousands of TDEs annually, with hundreds dating back to cosmic noon. This capability stems from Roman's high sensitivity, which allows it to see fainter and more distant events than ever before. 'The Roman Space Telescope is going to be transformative for transient science,' said research team leader Mitchell Karmen of Johns Hopkins University.
These observations could solve a puzzle raised by the James Webb Space Telescope (JWST), which has spotted supermassive black holes existing less than 1 billion years after the Big Bang. Such early black holes should have required billions of years to grow via mergers and feeding, yet they appear fully formed. TDEs detected by Roman can reveal the population of lighter supermassive black holes in the early universe, providing clues to how they grew so rapidly.
The findings could help distinguish between two prevailing theories: that black holes grew through rapid accretion in dense environments, or that they formed from the collapse of massive early stars. By observing TDEs at cosmic noon, astronomers can test these models and better understand the coevolution of black holes and galaxies. 'Thanks to Roman's high sensitivity, we can find multiple tidal disruption events out to greater distances and earlier cosmic times than ever before,' Karmen added.
Looking ahead, Roman's launch will mark a new era in transient astronomy. Combined with other observatories like the Vera C. Rubin Observatory, which is also expected to detect numerous TDEs, Roman will provide a comprehensive view of black hole activity across cosmic history. The telescope's ability to peer back to a time when the universe was just a few billion years old will fill a critical gap in our understanding of how supermassive black holes became the behemoths they are today.
As scientists prepare for Roman's mission, the anticipation is high. The telescope's data may not only confirm the prevalence of TDEs in the early universe but also reveal the mechanisms behind black hole growth. With its launch just two years away, the Roman Space Telescope promises to uncover the hidden lives of black holes and transform our view of the cosmos.
