Articles tagged with Comets
A Dartmouth-led team reveals that an asteroid impact in Quebec led to a global climate shift 12,900 years ago, causing the extinction of large mammals and prompting humans to adopt a hunter-gatherer diet. The study provides conclusive evidence linking extraterrestrial activity to environmental transformation.
The article highlights NASA's Hubble Space Telescope's incredible view of Comet ISON against a vast backdrop of galaxies and stars. The comet appears to be swimming through the cosmos despite its immense distance from Earth, showcasing the telescope's unparalleled resolution.
A new theoretical model suggests that an outburst event in the Sun's formative years could explain disparate evidence from comets and meteorites. The model also provides a possible explanation for the presence of heat-formed crystalline particles in comets and the ratios of aluminum isotopes found in primitive meteorites.
Comet ISON is approaching Earth, expected to be visible to the naked eye in November. The comet's icy nucleus and bright star-like coma create a tail of gas and dust streaming behind it.
Astronomers have discovered a 'dust trap' around a young star that is likely a comet factory, allowing particles to grow from millimetre size to comets. The observations, made using ALMA, reveal a ring of gas with a central hole created by an unseen planet or companion star.
The 2011 Draconid meteor shower deposited a large amount of meteoritic material on Earth, including fragments that may have formed from the comet Giacobini-Zinner. Researchers analyzed six fireballs and found they had a possible similar composition to carbonaceous chondrites.
Comet impacts are thought to have delivered massive amounts of organics to early Earth, which could have led to the formation of life. The study found that moderate shock pressures and temperatures produced nitrogen-containing heterocycles, while higher conditions resulted in methane and formaldehyde.
Researchers found lower than expected levels of iridium and osmium at the K-Pg boundary, contradicting the asteroid impact theory. A comet explanation reconciles this with evidence of a massive crater.
Astronomers use NASA's Swift satellite to estimate the size of comet ISON's icy nucleus based on water and dust production rates. The team finds that the comet is shedding large amounts of dust but relatively little water, indicating that other volatile materials are fueling its activity.
New experiments show that complex molecules can form in icy grains in space, potentially bringing the building blocks of life to Earth. The discovery opens the door to comets or meteorites as a source for life's origins.
At NASA's Goddard Space Flight Center, researchers create ultrathin layers of amorphous ice to replicate extreme chemistry found in space. They find that water helps amino acids last longer when exposed to cosmic radiation, producing new chemical byproducts.
Astronomers have observed a main-belt comet trail caused by an impulsive short-lived event around July 1st, 2011. The dust structure reveals physical properties of particles and proportions of different sizes.
Scientists have discovered six likely comets around distant stars, which could be a sign that comets are as common in other stellar systems as planets. The discovery was made using the high-resolution spectrograph of the McDonald Observatory telescope and suggests that comets may play a crucial role in planetary formation.
Using thermal models, scientists pinpointed the extremely cold regions where ice has been found on or below the surface. The dark deposits are thought to be a thin crust of residual organic material brought by asteroids and comets.
Tropical Storm Kirk is strengthening due to powerful thunderstorms and will likely turn into a hurricane over the weekend, according to NASA infrared imagery.
Researchers modelled comets and asteroid particles to explain their origins and compositions. The study found that these particles could have been processed in the hot inner disk of the Solar System before traveling out to icy comets, shedding light on the puzzle of how comets acquired different rim compositions.
A team of scientists led by Conel Alexander has found that carbonaceous chondrites, a type of primitive meteorite, are more likely to be the source of Earth's water than comets. This discovery contradicts prevailing theories and provides new constraints for understanding the origin of volatiles in the inner Solar System.
Researchers from 11 countries conduct the most comprehensive study on ice types and structures, revealing its impact on climate change and origin of life. The study also analyzes the un Predictability of avalanches and the presence of ice on Mars and comets.
Researchers use NASA's Swift satellite to study Comet Garradd as it moves beyond the solar system's snow line. The comet sheds water and dust at an unprecedented rate, offering clues about its composition and behavior.
Comet impacts may have delivered the building blocks of life to Earth, with amino acids forming peptide bonds despite intense heat and shock. This research provides further support for the comet delivery scenario, suggesting multiple deliveries of seedlings of life through comets, asteroids, and meteorites.
University of Hawaii scientists analyzed a tiny fragment from the comet Wild 2 to determine when it formed. The study found that the fragment formed at least three million years after the formation of the first solids in our Solar System, providing new insights into Jupiter's formation and the origins of the Solar System.
A comet was caught doing something never seen before: dying a scorching death as it flew too close to the sun. The comet's size and mass were estimated to be between 150-300 feet long, with its core evaporating in intense heat.
The Solar Heliophysics Observatory (SOHO) has discovered a new Kreutz-family comet, C/2011 W3 (Lovejoy), through ground-based telescope observations. This is the first time a Kreutz comet has been found in this way since the 1970s, providing scientists with an opportunity to study it before it moves into view of space-based telescopes.
Scientists at NASA's Goddard Space Flight Center are developing a comet harpoon to rapidly acquire samples from specific locations on rotating comets. The harpoon uses a
Scientists have identified areas with extreme potential for forming complex organic molecules, a key ingredient for life. These 'sweet spots' are found around newly formed stars and have conditions that support high methanol production.
A new theory suggests that high-speed collisions between planets and asteroids near supermassive black holes create microscopic dust clouds. This process blocks harmful radiation, creating a more hospitable environment for life in the galaxy's central region.
Scientists have discovered thousands of Earth-oceans' worth of water within the planet-forming disk of TW Hydrae. This finding suggests that comets could deliver vast amounts of water to new planets through impacts. The detection was made using the Heterodyne Instrument for the Far-Infrared on the Hershel Space Observatory.
Astronomers at the University of Michigan discovered ocean-like water in Comet Hartley 2, a finding that suggests comets may have delivered a significant portion of Earth's oceans. The discovery was made using data from the Herschel Space Observatory and suggests that the source of Earth's oceans is more complex than previously thought.
The comet's water production in 2010 was three times less than in 1997, with a sudden increase of hydrogen signatures detected by SWAN. This observation challenges standard models of comet behavior and highlights the need for further analysis to understand the underlying causes.
University of Alaska Fairbanks scientist Don Hampton analyzed the comet Hartley 2's nucleus, revealing a dynamic mass of ice and dust emitting gases through cracks. This research provides valuable insights into the composition and unique behavior of comets, shedding light on their role in the solar system's history.
The EPOXI mission confirms carbon dioxide as the volatile fuel for Comet Hartley 2's spectacular ice-spewing jets. The comet's unique rotation and surface features were also revealed, with blocky objects reaching 165 feet high and a 'snowstorm' created by water ice particles.
The EPOXI mission discovered that Hartley 2's strong activity in water release and carbon dioxide-powered jets occurred mainly at the ends of the comet, with most occurring at the small end. The study suggests that material in the waist region is likely redeposited material from the ends.
NASA has selected Southwest Research Institute's MASPEX mass spectrometer for technology development funding to analyze comets and improve understanding of their origin. The instrument is expected to excel in identifying isotopes in low-density populations and provide valuable insights into the origin of life.
Asteroid Scheila unexpectedly brightened with short-lived plumes after being struck by a smaller asteroid, according to data from NASA's Swift satellite and Hubble Space Telescope. The collision created a crater 1,000 feet across and ejected over 660,000 tons of dust.
Scientists discovered minerals requiring liquid water for formation in comet Wild-2, shattering the current paradigm that comets are frozen in time. The discovery provides evidence of a warm water phase and puts an upper limit on temperatures encountered by the comet during its origin.
Research suggests formaldehyde was likely source of solar system's organic carbon solids, abundant in comets and asteroids. The complex organic solids were formed from formaldehyde through polymerization under primitive solar system conditions.
The Stardust-NExT mission will allow scientists to study the surface of comet Tempel 1 before and after its orbit around the sun, comparing findings with previous probe data. The spacecraft's Dust Flux Monitor Instrument will also collect photographs of a crater left on Tempe 1 by a Deep Impact probe.
The Stardust NExT spacecraft will visit comet Tempel 1, taking photos of the crater formed during the Deep Impact mission. It will also measure particle size and distribution, and analyze their composition.
Researchers at the University of Tennessee, Knoxville, have discovered that water on the moon may have originated from comets smashing into the moon soon after its formation. This finding suggests that the moon can act as a stepping stone for further space exploration, enabling missions to fuel up with liquid hydrogen and oxygen.
SOHO has become the single greatest comet finder of all time, with over 2,000 comets discovered. The spacecraft was not designed for this purpose, but its cameras have proven effective in spotting comets due to their ability to block out the sun's brightness.
The Deep Impact spacecraft flew through a 'snowstorm' of fluffy particles on its encounter with comet Hartley 2, providing new insights into the nature and composition of comets. The spacecraft's High Resolution Imager captured images of clouds of large ice particles surrounding the nucleus, revealing a unique process driven by CO2 jets.
Scientists from the University of Maryland's EPOXI mission have discovered that dry ice is the 'jet' fuel for comets, including Hartley 2. The discovery reveals that solar heating of subsurface frozen carbon dioxide is powering the comet's jets, which are rich in CO2 gas and particles of dust and ice.
The UMD-led EPOXI spacecraft flew by comet Hartley 2 at a distance of 435 miles, collecting never-before-seen images that will help scientists understand the composition and diversity of comets. The mission aims to learn more about the origin and history of our solar system by studying the material from comets.
Archaeologists Vance Holliday and David Meltzer argue that the Clovis comet impact hypothesis is not supported by archaeological evidence. They found no evidence of a sudden cooling of the climate or a post-impact gap in human occupation at Clovis sites.
The Deep Impact spacecraft will fly past Earth for the fifth and last time on its EPOXI mission, changing its orbit to boost speed on its way to comet Hartley 2. The spacecraft's instruments will be used during an extended flyby in November to gather data on the comet.
A team of astronomers suggests that many comets, including Halley and Hale-Bopp, could be from other star systems. The researchers propose that the Sun captured these icy bodies during its birth in a dense gas cloud.
A new study suggests that many well-known comets, including Halley and Hale-Bopp, may have formed in orbit around other stars. The Sun is believed to have captured small icy bodies from its sibling stars, creating a reservoir for observed comets.
Researchers at the University of Leicester have dissected comet samples to reveal their true composition, shedding light on the Solar System's early stages and water delivery. They found unexpected signs of high-temperature iron oxides, raising questions about comet formation.
A team of researchers tracked a comet as it approached the sun using data from NASA's STEREO and SOHO spacecraft. The comet, believed to be part of the Kreutz family, survived the intense heat of the corona and evaporated in the chromosphere.
Asteroid 24 Themis has been found to have a thin film of ice coating its surface, with complex, long-chained molecules detected as well. This suggests that water ice is abundant in the asteroid's interior and may be responsible for delivering water to Earth.
New research identifies Jupiter Family comets as the primary source of the zodiacal cloud's eerie glow, contradicting previous theories that pointed to asteroid dust.
The European Space Agency's comet orbiter spacecraft Rosetta successfully tested the performance of its ultraviolet spectrometer Alice during a recent Earth flyby, revealing the Earth's unique ultraviolet spectral emission signature.
Researchers at the University of Kansas have discovered a potential signature of nitrate and ammonia that can be found in ice cores corresponding to suspected impacts. This finding could help scientists better understand the frequency of comet strikes on Earth, providing valuable insights for future predictions.
Researchers found ultra-primitive material with higher abundances of presolar grains, indicating a diverse processing of materials in different comets. This discovery allows for comparison of cosmic processes on a microscopic scale four-and-a-half billion years ago.
NASA researchers have discovered glycine, an amino acid used by living organisms to make proteins, in samples of comet Wild 2. The discovery supports the theory that some of life's ingredients formed in space and were delivered to Earth long ago.
New University of Washington research suggests comets unlikely cause mass extinctions, contradicting long-held belief. The study shows that Jupiter and Saturn's gravitational fields protect Earth from most comets, limiting potential impact.
A new study published in the International Journal of Astrobiology claims that comets contained vast oceans of liquid water during their formation, providing ideal conditions for primitive bacteria to grow and multiply. The study's findings support the theory of cometary panspermia, which suggests that life was introduced to Earth by c...
New Cornell University research links 1908 Tunguska explosion to comet entry, supported by NASA space shuttle exhaust plume. The study reveals a possible connection between the two events through noctilucent clouds, which are the Earth's highest clouds forming at high altitudes and in extremely cold temperatures.
Contrary to recent hypothesis, geologists argue that chevrons are not evidence of megatsunamis caused by asteroids or comets. Instead, they propose that similar formations can be explained by wind-blown deposits, supported by the presence of volcanic ash in similar locations.
Researchers found that comets delivered necessary ingredients for life in the Earth's ancient primordial soup. The chemical composition of comets allowed them to kickstart life by providing stable proportions of noble gases.