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Astronomy

The Unexpected Demise of Galaxies in the Early Universe

For a long time, scientists thought that only actively star-forming galaxies should be observed in the very early Universe. The James Webb space telescope now reveals that galaxies stopped forming stars earlier than expected. A recent discovery deepens the tension between theoretical models of cosmic evolution and actual observations. Among hundreds of spectra obtained with the Webb program RUBIES, the team has found a record-breaking galaxy that had already stopped forming stars during an epoch where galaxies are normally growing very rapidly.

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The recent discovery by an international team of astronomers has shed new light on the evolution of galaxies in the early universe. Using data from the James Webb space telescope, they have found evidence that galaxies stopped forming stars earlier than expected, contradicting theoretical models of cosmic evolution. The study, published in the Astrophysical Journal, reveals a galaxy that had already ceased star formation just 700 million years after the Big Bang.

In the early universe, galaxies grew by accreting gas from their surroundings and turning it into stars. However, this process eventually came to an end due to quenching, where galaxies no longer form new stars. Astronomers have long observed that about half of the galaxies in our local universe are “red and dead,” meaning they have stopped forming stars and appear red due to the presence of older, smaller stars.

The team’s discovery is significant because it pushes back the timeline for the formation of massive quiescent galaxies (MQGs) by hundreds of millions of years. These galaxies typically take longer to form than previously thought, but the new findings suggest that they may have been present in the early universe sooner than expected.

The galaxy, named RUBIES-UDS-QG-z7, was found using data from the James Webb space telescope’s wide-area program RUBIES (the Red Unknowns: Bright Infrared Extragalactic Survey). The NIRSpec/PRISM spectrum reveals a surprisingly old stellar population in such a young universe. Detailed modeling of the spectrum and imaging data shows that the galaxy formed a stellar mass of more than 10 billion solar masses within the first 600 million years after the Big Bang, before rapidly ceasing star formation.

The discovery implies that massive quiescent galaxies in the first billion years of the universe are more than 100 times more abundant than predicted by any model to date. This suggests that key factors in theoretical models may need to be revisited, and galaxies may have died much earlier than previously thought.

Finally, the small physical size of RUBIES-UDS-QG-z7 implies a high stellar mass density comparable to the highest central densities observed in quiescent galaxies at slightly lower redshifts. This provides strong evidence that the centers of some nearby massive ellipticals may have already been in place since the first few hundred million years of the universe.

The unexpected demise of galaxies in the early universe has significant implications for our understanding of cosmic evolution and the formation of galaxies. Further research is needed to confirm these findings and shed more light on the mysteries of galaxy formation.

Astronomy

Hubble Captures a Dazzling Star-Birthing Storm 160,000 Light-Years Away

Hubble’s latest portrait of the Tarantula Nebula reveals a turbulent star-making region far beyond the Milky Way. Located 160,000 light-years away in the Large Magellanic Cloud, this cosmic expanse is home to some of the most massive stars ever discovered—up to 200 times the Sun’s mass. The image captures intricate dust clouds, intense stellar winds from rare Wolf–Rayet stars, and the extraordinary chaos that fuels the birth of new suns.

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Get ready to be amazed by one of the most incredible sights in the universe! The NASA/ESA Hubble Space Telescope has captured a breathtaking picture of the star-forming region known as the Tarantula Nebula. But what’s truly remarkable about this stunning image is that it’s not even located within our own galaxy, the Milky Way. Instead, it resides 160,000 light-years away in the Large Magellanic Cloud, a dwarf galaxy nestled in the constellations Dorado and Mensa.

The Tarantula Nebula is like a cosmic factory, churning out new stars at an incredible rate. It’s the largest and brightest star-forming region not just in the Large Magellanic Cloud but also in our entire local group of galaxies. This nebula is home to some of the most massive stars known, with some being roughly 200 times as massive as our Sun.

The Hubble Space Telescope has taken a detailed image of this cosmic wonder, revealing incredible sculptural details in its dusty clouds. The scene captured by Hubble is located away from the center of the nebula, where there’s a super star cluster called R136. But very close to this cluster lies a rare type of star called a Wolf-Rayet star.

Wolf-Rayet stars are extremely hot and luminous, with dense and furious stellar winds that power their massive energy output. The Tarantula Nebula is a frequent target for Hubble, thanks to its multiwavelength capabilities, which allow it to capture the intricate details in the nebula’s dusty clouds.

The data used to create this image come from an observing program called Scylla, named after a multi-headed sea monster from Greek mythology. The Scylla program was designed to complement another Hubble observing program called ULLYSSES (Ultraviolet Legacy Library of Young Stars as Essential Standards). While ULLYSSES targets massive young stars in the Small and Large Magellanic Clouds, Scylla investigates the structures of gas and dust that surround these stars.

This stunning image of the Tarantula Nebula serves as a reminder of the awe-inspiring beauty and mystery that lies just beyond our galaxy. It’s a testament to the power of Hubble to capture and reveal the intricate details of our universe, even in the most distant reaches of space.

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Astronomy

A Star That Defied Death: The Supernova Survivor

In a spectacular image captured by the Hubble Space Telescope, the spiral galaxy NGC 1309 glows with cosmic elegance and hides a strange survivor.

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The story of a star that survived its own supernova explosion is one of cosmic resilience. Located within the Milky Way galaxy, this remarkable star shone even brighter after being struck by a massive explosion in 2012. Its journey to becoming a supernova survivor began thousands of years ago, and it has captivated scientists ever since.

The spiral galaxy NGC 1309, situated about 100 million light-years away in the constellation Eridanus, is home to this incredible star. In stunning images captured by the NASA/ESA Hubble Space Telescope, the galaxy reveals its intricate details: bluish stars, dark brown gas clouds, and a pearly white center. The image also showcases hundreds of distant background galaxies, each one a cosmic wonder in its own right.

The remarkable story of this supernova survivor begins with two significant events: SN 2002fk in 2002 and SN 2012Z in 2012. While the first event was a perfect example of a Type Ia supernova, which occurs when the core of a dead star (a white dwarf) explodes, the second event was different – it was classified as a Type Iax supernova.

Unlike its Type Ia counterpart, SN 2012Z did not completely destroy the white dwarf, leaving behind a ‘zombie star’ that shone even brighter than before. This phenomenon has never been observed before, and scientists have used Hubble observations to study this extraordinary event in detail.

In fact, these observations also made it possible to identify the white dwarf progenitor of a supernova for the first time ever, providing valuable insights into the cosmic processes that shape our universe. The story of this star’s survival is a testament to the awe-inspiring power and complexity of the cosmos.

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Astronomy

The Cosmic Dance: An Ultra-Hot Jupiter’s Imminent Demise May Reveal Secrets of Rocky World Formation

A massive, fast-orbiting planet is inching closer to its star, and scientists now have direct evidence of its impending demise. It could disintegrate, burn up, or be stripped bare, offering rare clues into how planetary systems evolve.

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The discovery of an ultra-hot Jupiter exoplanet named TOI-2109b has left astronomers on high alert, as this extreme planet is now spiraling towards its star at a breakneck pace. Located a staggering 870 light-years from Earth, this gargantuan gas giant completes an orbit around its star in just 16 hours – a record that makes it the closest hot Jupiter ever discovered.

“We’re witnessing a cosmic death dance,” says Dr. Jaime A. Alvarado-Montes, a Macquarie Research Fellow who led the international study published on July 15 in The Astrophysical Journal. “TOI-2109b is super-close to its star, and its mass is nearly five times that of Jupiter. It’s like Mercury’s mass, but it takes just 16 hours for this huge gas giant to orbit its star.”

The team analyzed transit timing data from multiple ground-based telescopes, NASA’s TESS mission, and the European Space Agency’s CHEOPS satellite spanning 2010 to 2024. The results revealed subtle changes in the planet’s orbit, confirming that TOI-2109b may be spiraling towards its star.

The researchers have identified three possible fates for this doomed exoplanet: it could be torn apart by tidal forces, plunge directly into its star, or have its gaseous envelope stripped away by intense radiation, leaving only a rocky core. This cataclysmic event could provide valuable insights into the mysteries of planetary evolution and the formation of rocky worlds.

The study suggests that some rocky planets in other solar systems might be the stripped cores of former gas giants – a possibility that could reshape our understanding of planetary evolution. As astronomers continue to monitor TOI-2109b over the next three to five years, they will detect the predicted orbital changes, providing real-time observation of a planetary system in its death throes.

This remarkable discovery has left scientists on high alert, and it’s only a matter of time before we witness the impending doom of this ultra-hot Jupiter. As we gaze into the cosmos, we are reminded that there is still so much to learn about our universe and its many secrets waiting to be uncovered.

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