Rubin Observatory's COSMOS image reveals more than 500,000 galaxies in an unprecedented deep view of the Universe

The Vera C. Rubin Observatory has once again demonstrated why it is poised to transform modern astronomy by releasing one of the deepest and most detailed images of the Universe ever captured. The newly unveiled view of the famous COSMOS field showcases more than 500,000 galaxies alongside over 50,000 stars from our own Milky Way, offering scientists and the public an extraordinary glimpse into the vastness of the cosmos.

The image represents the first Early Data Preview based on observations made with the Rubin Observatory's revolutionary LSST Camera, the largest digital camera ever built for astronomy. Instead of relying on a single exposure, researchers combined hundreds of individual observations collected between April 2025 and January 2026 to create an exceptionally deep composite image capable of revealing galaxies across billions of years of cosmic history.

What makes this achievement remarkable is not only the staggering number of visible galaxies but also the incredible range of distances they represent. The COSMOS field, located in the constellation Sextans, has long been one of the most intensively studied regions of the sky because it lies away from the dense plane of the Milky Way, allowing astronomers to peer deep into the distant Universe with minimal interference from foreground stars and dust. The Rubin Observatory's new image pushes this field to unprecedented levels of detail, revealing spiral galaxies, elliptical galaxies, galaxy clusters, interacting systems, and countless faint objects that were previously difficult or impossible to study.

The LSST Camera is uniquely designed for this type of scientific work. With an astonishing resolution of 3,200 megapixels, each image covers an area of the sky roughly equivalent to 45 full moons while maintaining extraordinary sharpness. This combination of an enormous field of view and exceptional sensitivity enables Rubin to observe vast regions of the sky without sacrificing fine detail, a capability unmatched by any previous survey telescope.

Although the released image is breathtaking on its own, it represents only a tiny fraction of Rubin Observatory's full scientific mission. During its decade-long Legacy Survey of Space and Time (LSST), the observatory will repeatedly photograph the entire southern sky every few nights. This continuous monitoring will allow astronomers to detect changes across the Universe, from exploding stars and variable galaxies to potentially hazardous asteroids, comets, and other transient phenomena that appear or disappear over time.

Repeated observations also allow scientists to combine multiple exposures into increasingly deeper images. Every new observation adds more light, making extremely faint and distant galaxies easier to detect while improving image quality. The COSMOS release serves as a powerful demonstration of this technique, showing how Rubin's data will become progressively richer throughout its mission.

Beyond creating beautiful astronomical images, Rubin Observatory is expected to address some of the biggest unanswered questions in cosmology. By mapping billions of galaxies and tracking their evolution across cosmic time, researchers hope to better understand the distribution of dark matter, investigate the mysterious force known as dark energy, and reconstruct how large-scale structures formed throughout the Universe. The enormous dataset will also help scientists study galaxy evolution, star formation, black holes, and the history of the cosmos with unprecedented statistical precision.

The observatory's ability to repeatedly scan the night sky will fundamentally change how astronomers study dynamic events. Instead of taking isolated snapshots, Rubin will effectively produce a time-lapse movie of the Universe, capturing changes that occur over days, months, and years. This approach is expected to lead to countless discoveries, many of which cannot yet be predicted.

For the public, the COSMOS image is equally inspiring. Zooming into the full-resolution version reveals an almost endless sea of galaxies, each containing billions of stars and potentially countless planetary systems. Most of the tiny points of light visible in the image are not stars within our own galaxy but entire galaxies located millions or even billions of light-years away, emphasizing both the immense scale of the Universe and humanity's growing ability to explore it.

The Rubin Observatory's latest release is more than just another spectacular space photograph. It is an early demonstration of what promises to become one of the most ambitious astronomical surveys ever undertaken. As the observatory continues collecting data over the coming years, scientists anticipate discoveries that will reshape our understanding of the Universe, while the public gains access to some of the most detailed cosmic views ever produced. The COSMOS image is only the beginning of a scientific journey that is expected to redefine observational astronomy for decades to come.

Kepler-1934 b: everything we know about this scorching Earth-sized exoplanet

Kepler-1934 b is one of thousands of confirmed exoplanets discovered by NASA's Kepler Space Telescope, yet it stands out as an intriguing example of a small, rocky world orbiting perilously close to its parent star. Although it is unlikely to host life as we know it, the planet provides astronomers with valuable insights into the diversity of terrestrial exoplanets and the extreme environments that exist throughout the Milky Way.

The planet was confirmed in 2021 after detailed analysis of data collected during the Kepler mission. Like the overwhelming majority of Kepler's discoveries, Kepler-1934 b was detected using the transit method. This technique identifies planets by measuring the tiny, periodic decrease in a star's brightness as an orbiting planet passes in front of it from our point of view. Even though the resulting dimming is incredibly small, modern space telescopes can measure these subtle changes with extraordinary precision, allowing scientists to determine a planet's size and orbital characteristics.

Kepler-1934 b orbits the Sun-like star Kepler-1934, a G-type star with an effective temperature of approximately 5,930 Kelvin. The star is slightly larger than our Sun and is located roughly 1,400 light-years from Earth in the direction of the constellation Cygnus. Because of this enormous distance, direct imaging of the planet is currently impossible, making transit observations the primary source of information about the system.

The exoplanet itself is remarkably similar to Earth in size. It has a radius of approximately 0.91 Earth radii, making it slightly smaller than our planet. Current estimates place its mass at about 0.70 Earth masses, indicating that it is most likely a terrestrial world composed primarily of rock and metal rather than gas or ice. These measurements distinguish it from the much larger gas giants and mini-Neptunes that dominate many exoplanet catalogs.

Despite its Earth-like dimensions, Kepler-1934 b is anything but Earth-like in terms of its environment. The planet completes an orbit around its host star in just 1.42 days, compared with Earth's 365-day year. This astonishingly short orbital period means it circles extremely close to its star, at an average distance of only about 0.0247 astronomical units. For comparison, Mercury orbits the Sun at approximately 0.39 astronomical units, placing Kepler-1934 b nearly sixteen times closer to its star than Mercury is to ours.

Such proximity exposes the planet to an extraordinary amount of stellar radiation. Estimates suggest that it receives well over 1,800 times the solar energy that Earth receives from the Sun. As a result, its equilibrium temperature is believed to be around 1,700 Kelvin, or roughly 1,430 degrees Celsius. At these temperatures, rocks could partially melt, many metals would become liquid, and no known form of life could survive on the surface.

The orbit of Kepler-1934 b appears to be essentially circular, with an eccentricity very close to zero. Circular orbits are common among planets located extremely close to their stars because tidal forces gradually eliminate orbital eccentricity over millions or billions of years. Those same tidal interactions almost certainly mean that Kepler-1934 b is tidally locked, with one hemisphere permanently facing its star while the opposite side remains in perpetual darkness. This configuration would produce enormous temperature differences between the day and night sides, although any atmosphere—if one still exists—could redistribute some of that heat.

Whether the planet retains a significant atmosphere remains an open question. The intense stellar radiation and powerful stellar winds associated with such close orbits can gradually strip away atmospheric gases. If Kepler-1934 b once possessed a thick atmosphere, much of it may have been lost over geological time. Alternatively, if volcanic activity remains vigorous, the planet could still maintain a thin atmosphere replenished from its interior. Future observations with next-generation telescopes may help answer this question.

Kepler-1934 b also contributes to one of the most important areas of modern exoplanet research: understanding the population of rocky planets in our galaxy. Every newly confirmed terrestrial exoplanet improves statistical models that describe how planets form and evolve. By comparing worlds like Kepler-1934 b with larger super-Earths, mini-Neptunes, and gas giants, astronomers can better understand why planetary systems exhibit such extraordinary diversity.

The Kepler mission revolutionized astronomy by demonstrating that planets are common throughout the Milky Way. Before its launch in 2009, only a few hundred exoplanets were known. Today, thanks largely to Kepler's observations and subsequent follow-up studies, thousands of confirmed exoplanets have been cataloged. Kepler-1934 b is one of many discoveries that continue to refine our understanding of planetary formation and the frequency of Earth-sized worlds in our galaxy.

Although Kepler-1934 b is far too hot to be considered habitable, its discovery remains scientifically significant. It illustrates that rocky planets can exist under conditions vastly different from those found in our Solar System. Studying these extreme worlds helps astronomers test theories about planetary interiors, atmospheric evolution, tidal interactions, and the long-term effects of intense stellar radiation.

As new observatories continue to expand humanity's ability to study distant planetary systems, worlds like Kepler-1934 b will become increasingly important. While this small, scorched planet may never be a candidate for life, it represents another crucial piece of the cosmic puzzle, reminding us that the universe contains an astonishing variety of planets far beyond anything found in our own celestial neighborhood.