All posts tagged: galaxy formation

Astronomers Discover Potential ‘Dark Galaxy’ Near the Milky Way

Astronomers Discover Potential ‘Dark Galaxy’ Near the Milky Way

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Astronomers might have discovered a dark galaxy, primarily made up of dark matter, in the local universe. Dark galaxies are theoretical starless systems that could provide valuable insight for galaxy formation models. The candidate was in a massive, rapidly moving gas cloud, first discovered in the 1960s. At high resolution, the methyl formate cloud appeared to be a tight knot of gas, potentially forming a dark galaxy. But not all astronomers are convinced. It’s more likely to be a regular gas cloud at the edge of the Milky Way, says the astronomer Tobias Westmeier. The study was published in Science Adviser. It reveals that since the early 2000s, a few possible dark galaxies have been discovered close to the Milky Way. However, multiple studies have suggested that these alleged dark galaxies were misclassified. The study further highlights that the hypothetical dark galaxy evolved this way after a collision with cosmic gas close to our galaxy. Finding dark galaxies could enable better computer simulations and provide fresh insight into galaxy development. Astronomers Discover Dark Galaxy Candidate Near Milky Way …

Smallest Galaxy Ever Found: Andromeda XXXV Defies Cosmic Evolution Models

Smallest Galaxy Ever Found: Andromeda XXXV Defies Cosmic Evolution Models

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Astronomers have identified the smallest and faintest galaxy ever observed, located approximately 3 million light-years away. This discovery challenges existing theories on galaxy formation, as such tiny galaxies were expected to have been destroyed in the intense heat and density of the early universe. Named Andromeda XXXV, this newly identified galaxy is part of a group of small satellite galaxies orbiting Andromeda. Researchers suggest that its survival could reshape the understanding of cosmic evolution and the conditions that allowed small galaxies to persist. Characteristics of Andromeda XXXV According to the study published in The Astrophysical Journal Letters, Andromeda XXXV is significantly smaller than other known dwarf galaxies, measuring about 1,000 light-years across at its longest axis. Researchers used data from multiple astronomical surveys and observations from the Hubble Space Telescope to confirm its existence. Reportedly, Eric Bell, a professor at the University of Michigan, described it as “a fully functional galaxy, but about a millionth the size of the Milky Way.” Scientists were surprised by its ability to retain the necessary conditions for star formation …

Early Supernovas Could Have Created Water in the Universe, Paving the Way for Life 100 Million Years Post-Big Bang

Early Supernovas Could Have Created Water in the Universe, Paving the Way for Life 100 Million Years Post-Big Bang

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New research suggests that supernovas, resulting from the explosive deaths of the earliest stars in the universe, may have created vast amounts of water, possibly enabling the existence of life as early as 100 million years after the Big Bang. These findings, based on simulations of short-lived, massive stars, point to water forming within dense clouds of hydrogen and oxygen left behind by stellar explosions, raising questions about the origins of water in the cosmos and its potential role in early galaxy formation. Formation of Water in Early Stars According to the study uploaded to arXiv on January 9, simulations were conducted on early stars, known as population III stars, which were estimated to have masses around 200 times that of the Sun. The researchers indicated that the dense material expelled during supernovas likely created favourable conditions for water molecules to form, with concentrations speculated to be up to 30 times higher than what has been observed in interstellar gas clouds within the Milky Way. As reported by Live Science, the study noted that this …

NASA’s Webb Telescope Reveals Firefly Sparkle, a Milky Way-Like Galaxy

NASA’s Webb Telescope Reveals Firefly Sparkle, a Milky Way-Like Galaxy

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A galaxy nicknamed the Firefly Sparkle has been detected by NASA’s James Webb Space Telescope, marking a significant discovery. According to research published in Nature on December 11, this galaxy existed approximately 600 million years after the Big Bang and has a mass similar to the Milky Way at a comparable stage of development. The discovery highlights unique insights into the early universe, as previously identified galaxies from this era have been significantly larger. Reports indicate that the Firefly Sparkle galaxy is distinguished by its ten active star clusters. These clusters were analysed in detail by researchers, revealing staggered star formation rather than simultaneous activity. This galaxy appears as a long, stretched arc in images due to gravitational lensing caused by a massive foreground galaxy cluster. Chris Willott, principal investigator from the Herzberg Astronomy and Astrophysics Research Centre in Canada, noted that Webb’s data unveiled a variety of star clusters within the galaxy. Willott was quoted saying that each clump is undergoing a distinct phase of evolution. According to Nature, gravitational lensing significantly enhanced the …