WhyCosmo

  NASA's Parker Solar Probe is gearing up for its seventh and final Venus flyby on November 6, 2024 . The spacecraft performed a small but critical maneuver on August 26 , adjusting its course to bring it closer to Venus. This final flyby is essential to ensure that the Parker Probe can eventually get within 3.8 million miles of the Sun's surface , closer than ever before. Venus imaged by the Magellan spacecraft. Credit: NASA/JPL The maneuver lasted only 17 seconds , bringing the spacecraft 386 miles closer to its target, allowing Parker to approach 240 miles above Venus' surface. This flyby is critical to using Venus' gravity to tighten the spacecraft's orbit around the Sun. After passing Venus, Parker Solar Probe will break records again, whizzing past the Sun at a mind-blowing 430,000 miles per hour on December 24, 2024 . The current phase of the mission, the 21st orbit , is set to conclude with a solar encounter on September 30, 2024 , coming just 4.51 milli...

  Like two cosmic sumo wrestlers, NASA’s Hubble Space Telescope and Chandra X-ray Observatory have detected the closest-ever pair of supermassive black holes . Located in the galaxy MCG-03-34-64 , these two giants are just 300 light-years apart and are about to embark on a galactic dance that will eventually end in a massive collision . As they devour gas and dust from their surroundings, they glow brightly as active galactic nuclei (AGN) , giving us a rare peek into the process of galaxy mergers . This is an artist's depiction of a pair of active black holes at the heart of two merging galaxies. They are both surrounded by an accretion disk of hot gas. Some of the material is ejected along the spin axis of each black hole. Confined by powerful magnetic fields, the jets blaze across space at nearly the speed of light as devastating beams of energy. NASA, ESA, Joseph Olmsted (STScI) This discovery is even more exciting because such close black hole pairs are scarce in our local un...

Astronomers have made an incredible discovery of a pair of galaxies merging 12.8 billion years ago , which will deepen our understanding of early galaxy evolution. This cosmic dance is expected to birth a "monster galaxy" —one of the universe's brightest and most powerful objects . Artist's impression of the interacting galaxies observed in this research. The gravitational interactions during the merger trigger both starburst and quasar activity. Credit: ALMA (ESO/NAOJ/NRAO), T.Izumi et al. Using the ALMA radio telescope, an international team led by Takuma Izumi studied these galaxies in the constellation Virgo during the universe's infancy, just 900 million years after the Big Bang. The team observed a "bridge" of gas and dust connecting the galaxies, confirming that they were in the process of merging. This discovery suggests that the merger will result in more vigorous quasar activity caused by gas falling into supermassive black holes and lead t...

Astronomers have made an exciting discovery of a peculiar lithium-rich star named J0524-0336 that challenges current theories of stellar evolution. This red giant, which is about 40 times the size of our Sun, has been found to contain 100,000 times more lithium than our Sun at a similar stage of life. The discovery, published in the Astrophysical Journal , could indicate a new evolutionary phase in a star's life cycle. Artist rendering of a red giant. Credit: DarkBlackKnight / Wikimedia Commons. (CC-BY-SA-4.0) Stars typically burn lighter elements like hydrogen, helium, and lithium to produce heavier ones through nuclear fusion. However, J0524-0336 defies the norm, suggesting that unknown mechanisms might be at play that allow this star to retain or produce lithium in large amounts. The research team led by Professor Rana Ezzeddine from the University of Florida proposes two possibilities: either J0524-0336 is undergoing a new evolutionary phase, or it may have absorbed a lithiu...

 In a dramatic bid to save one of NASA 's most productive space observatories, astronomers across the globe are uniting to prevent the shutdown of the Chandra X-ray Observatory . Launched in 1999 , Chandra has revolutionized our understanding of the universe by providing stunning insights into black holes , stellar explosions , and other cosmic wonders . Despite being fully operational with a decade of fuel left, NASA's budget shortfalls have placed the telescope on the chopping block. An artist's impression of the Chandra X-ray Observatory. Credit: NASA/CXC & J. Vaughan This decision has sparked worldwide protests under the #SaveChandra movement, with scientists warning that shutting down such a technologically advanced telescope would leave an irreplaceable gap in X-ray astronomy. Chandra's unique ability to provide high-resolution images of distant cosmic phenomena remains unmatched by any existing or upcoming projects from Europe or China. NASA released this c...

  The mystery behind the universe's expansion rate may finally be solved , thanks to new data from NASA's James Webb Space Telescope . For over two decades, astronomers have debated the " Hubble constant ," a value essential to understanding how fast the universe is expanding. This debate, known as the " Hubble tension ," had two conflicting measurements, suggesting that something might be missing from our universe model. Scientists used new data taken by the James Webb Space Telescope to make a  However, a recent study led by renowned cosmologist Wendy Freedman of the University of Chicago indicates that there may not be a conflict after all. Freedman and her team used the Webb Telescope to measure the distance to ten nearby galaxies, finding that the expansion rate was about 70 kilometers per second per megaparsec, aligning closely with previous methods. An artist's concept showing the expansion of the universe over time since the Big Bang By using th...

    In a breathtaking discovery, astronomers have captured the dramatic transformation of a  supermassive black hole  as it "wakes up" and begins to glow for the first time. This cosmic giant, located  300 million light-years  away at the center of the  galaxy SDSS1335+0728 , has stunned the scientific community by transitioning from a dormant state to a highly active one, a process never observed in real time. A supermassive black hole in galaxy SDSS1335+0728 has lit up. This could give astronomers a new look at how such celestial beasts awaken. This groundbreaking observation, shared in the journal  Astronomy and Astrophysics  on June 18, 2024, sheds new light on the mysterious workings of active galactic nuclei (AGN)—the intensely bright cores of galaxies powered by supermassive black holes consuming vast amounts of matter. The findings could revolutionize our understanding of how these powerful cosmic engines ignite and evolve. The awaken...

In an extraordinary cosmic event, NASA’s Fermi Telescope has uncovered groundbreaking details about the brightest gamma-ray burst (GRB) ever observed—the BOAT (Brightest Of All Time) . This intense GRB, labeled GRB 221009A , was detected in October 2022 , emanating from a supernova 2.4 billion light years away. This gamma-ray burst was at least ten times more potent than any previously detected, leaving astronomers shocked and puzzled. A jet of particles moving at nearly light speed emerges from a massive star in this artist’s concept. Credit: NASA’s Goddard Space Flight Center Conceptual Image Lab. What Ar e Gamma-Ray Bursts? Gamma-ray bursts are brief but intense flashes of gamma radiation, typically lasting less than a second. These bursts originate from the remnants of a dead giant star’s core, known as a neutron star. However, the exact mechanism behind these explosive energy releases remains a mystery. A Historic Discovery For the first time in 50 years of GRB research, scie...

 The NASA/ESA Hubble Space Telescope has captured an intriguing image of the dwarf irregular galaxy NGC 5238 , located 14.5 million light-years away in the constellation Canes Venatici. At first glance, this galaxy might appear as a simple, oversized star cluster rather than a classic galaxy, but there's more to it than meets the eye. This NASA/ESA Hubble Space Telescope image captures the dwarf irregular galaxy Hubble's image reveals a complex structure teeming with countless stars and globular clusters. Astronomers believe that NGC 5238 had a close encounter with another galaxy approximately a billion years ago. This interaction likely caused the distorted shape of NGC 5238 as gravitational forces pulled and twisted the stars. The absence of a nearby galaxy suggests that NGC 5238 devoured a smaller satellite galaxy. By studying the star population within NGC 5238, astronomers hope to find traces of this consumed galaxy. Indicators include groups of stars with distinct prope...

 Astronomers using JWST (the James Webb Space Telescope) have made a groundbreaking discovery, witnessing an awe-inspiring cosmic dance between a supermassive black hole-powered quasar and merging galaxies. This extraordinary event occurred less than a billion years after the Big Bang, providing a rare glimpse into the early universe's mysteries. The quasar, designated PJ308-21, is an active galactic nucleus (AGN) in a galaxy merging with two massive satellite galaxies. Observations reveal that the supermassive black hole at the heart of PJ308-21 consumes surrounding matter, powering the quasar's incredible brightness. Astonishingly, this black hole has a mass equivalent to two billion suns. This cosmic merger is a dramatic event, delivering vast amounts of gas and dust to the supermassive black hole, fueling its growth, and ensuring the continued brilliance of PJ308-21. These findings show how galaxies and supermassive black holes evolved in the universe's infancy. Roberto...

  In an extraordinary breakthrough, a team of astronomers has unveiled that the temperate exoplanet LHS 1140 b might be a " super-Earth " covered in ice or water , located just 48 light-years from us! 🌌🔭 Temperate exoplanet LHS 1140 b may be a world completely covered in ice (left) similar to Jupiter’s moon Europa or may be an ice world with a liquid substellar ocean and a cloudy atmosphere (center). LHS 1140 b is 1.7 times the size of our planet Earth (right) and is the most promising habitable zone exoplanet yet found in the search for liquid water beyond the Solar System. Credit: Benoit Gougeon, Université de Montréal 🌟 LHS 1140 b: The New Super-Earth 🌟 Originally thought to be a mini-Neptune, LHS 1140 b is now considered a potential super-Earth with a nitrogen-rich atmosphere, thanks to the cutting-edge James Webb Space Telescope (JWST) data. Situated in its star's habitable zone , this planet could have the perfect conditions for liquid water, making it a prim...