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Topic: Galaxy

NASA study shows K Stars more likely to host Habitable Planets

 

NASA Goddard Space Flight Center

NASA - National Aeronautics and Space AdministrationGreenbelt, MD – NASA says scientists looking for signs of life beyond our solar system face major challenges, one of which is that there are hundreds of billions of stars in our galaxy alone to consider. To narrow the search, they must figure out: What kinds of stars are most likely to host habitable planets?

A new study finds a particular class of stars called K stars, which are dimmer than the Sun but brighter than the faintest stars, may be particularly promising targets for searching for signs of life.

This is an artist's concept of a planet orbiting in the habitable zone of a K star. (NASA Ames/JPL-Caltech/Tim Pyle)

This is an artist’s concept of a planet orbiting in the habitable zone of a K star. (NASA Ames/JPL-Caltech/Tim Pyle)

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NASA reports Galactic Wind Provides Clues to Evolution of Galaxies

 

NASA Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – The Cigar Galaxy (also known as M82) is famous for its extraordinary speed in making new stars, with stars being born 10 times faster than in the Milky Way. Now, data from the Stratospheric Observatory for Infrared Astronomy, or SOFIA, have been used to study this galaxy in greater detail, revealing how material that affects the evolution of galaxies may get into intergalactic space.

Researchers found, for the first time, that the galactic wind flowing from the center of the Cigar Galaxy (M82) is aligned along a magnetic field and transports a very large mass of gas and dust – the equivalent mass of 50 million to 60 million Suns.

The magnetic field lines of the the Cigar Galaxy (also called M82) appear in this composite image. The lines follow the bipolar outflows (red) generated by exceptionally high rates of star formation. (NASA/SOFIA/E. Lopez-Rodiguez; NASA/Spitzer/J. Moustakas et al)

The magnetic field lines of the the Cigar Galaxy (also called M82) appear in this composite image. The lines follow the bipolar outflows (red) generated by exceptionally high rates of star formation. (NASA/SOFIA/E. Lopez-Rodiguez; NASA/Spitzer/J. Moustakas et al)

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NASA’s SPHEREx mission to look into History of the Universe

 

NASA Headquarters

NASA - National Aeronautics and Space AdministrationWashington, D.C. – NASA has selected a new space mission that will help astronomers understand both how our universe evolved and how common are the ingredients for life in our galaxy’s planetary systems.

The Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) mission is a planned two-year mission funded at $242 million (not including launch costs) and targeted to launch in 2023.

NASA's Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) mission is targeted to launch in 2023. SPHEREx will help astronomers understand both how our universe evolved and how common are the ingredients for life in our galaxy's planetary systems. (Caltech)

NASA’s Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer (SPHEREx) mission is targeted to launch in 2023. SPHEREx will help astronomers understand both how our universe evolved and how common are the ingredients for life in our galaxy’s planetary systems. (Caltech)

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NASA Telescopes used to study unusual Flash of Light nicknamed “The Cow”

 

Written by Jeanette Kazmierczak
NASA Goddard Space Flight Center

NASA - National Aeronautics and Space AdministrationGreenbelt, MD – A brief and unusual flash spotted in the night sky on June 16th, 2018, puzzled astronomers and astrophysicists across the globe. The event – called AT2018cow and nicknamed “the Cow” after the coincidental final letters in its official name – is unlike any celestial outburst ever seen before, prompting multiple theories about its source.

Over three days, the Cow produced a sudden explosion of light at least 10 times brighter than a typical supernova, and then it faded over the next few months.

AT2018cow erupted in or near a galaxy known as CGCG 137-068, which is located about 200 million light-years away in the constellation Hercules. This zoomed-in image shows the location of the "Cow" in the galaxy. (Sloan Digital Sky Survey)

AT2018cow erupted in or near a galaxy known as CGCG 137-068, which is located about 200 million light-years away in the constellation Hercules. This zoomed-in image shows the location of the “Cow” in the galaxy. (Sloan Digital Sky Survey)

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NASA’s New Horizons Spacecraft takes detailed photos of Ultima Thule

 

NASA Marshall Space Flight Center

NASA - National Aeronautics and Space AdministrationHuntsville, AL – Scientists from NASA’s New Horizons mission released the first detailed images of the most distant object ever explored — the Kuiper Belt object nicknamed Ultima Thule. Its remarkable appearance, unlike anything we’ve seen before, illuminates the processes that built the planets four and a half billion years ago.

“This flyby is a historic achievement,” said New Horizons Principal Investigator Alan Stern of the Southwest Research Institute in Boulder, Colorado. “Never before has any spacecraft team tracked down such a small body at such high speed so far away in the abyss of space. New Horizons has set a new bar for state-of-the-art spacecraft navigation.”

This image taken by the Long-Range Reconnaissance Imager (LORRI) is the most detailed of Ultima Thule returned so far by the New Horizons spacecraft. It was taken at 5:01 Universal Time on January 1, 2019, just 30 minutes before closest approach from a range of 18,000 miles (28,000 kilometers), with an original scale of 459 feet (140 meters) per pixel. (NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute)

This image taken by the Long-Range Reconnaissance Imager (LORRI) is the most detailed of Ultima Thule returned so far by the New Horizons spacecraft. It was taken at 5:01 Universal Time on January 1, 2019, just 30 minutes before closest approach from a range of 18,000 miles (28,000 kilometers), with an original scale of 459 feet (140 meters) per pixel. (NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute)

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NASA study discovers Galaxy that is devouring it’s smaller neighbors

 

NASA Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – The most luminous galaxy ever discovered is cannibalizing not one, not two, but at least three of its smaller neighbors, according to a new study published today (November 15th) in the journal Science and coauthored by scientists from NASA’s Jet Propulsion Laboratory in Pasadena, California. The material that the galaxy is stealing from its neighbors is likely contributing to its uber-brightness, the study shows.

Discovered by NASA’s space-based Wide-field Infrared Survey Explorer (WISE) in 2015, the galaxy, called WISE J224607.55-052634.9, is by no means the largest or most massive galaxy we know of, but it radiates at 350 trillion times the luminosity of the Sun.

This artist's impression shows galaxy WISE J224607.55-052634.9, the most luminous galaxy ever discovered. A new study using data from the Atacama Large Millimeter/submillimeter Array (ALMA) shows that this galaxy is syphoning dust and other material from three of its smaller galactic neighbors. )(NRAO/AUI/NSF) S. Dagnello)

This artist’s impression shows galaxy WISE J224607.55-052634.9, the most luminous galaxy ever discovered. A new study using data from the Atacama Large Millimeter/submillimeter Array (ALMA) shows that this galaxy is syphoning dust and other material from three of its smaller galactic neighbors. )(NRAO/AUI/NSF) S. Dagnello)

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NASA SOFIA telescope helps scientists unravel Star Cluster Formation Mystery

 

NASA Ames Research Center

NASA - National Aeronautics and Space AdministrationMoffett Field, CA – The sun, like all stars, was born in a giant cold cloud of molecular gas and dust. It may have had dozens or even hundreds of stellar siblings – a star cluster – but these early companions are now scattered throughout our Milky Way galaxy.

Although the remnants of this particular creation event have long since dispersed, the process of star birth continues today within our galaxy and beyond. Star clusters are conceived in the hearts of optically dark clouds where the early phases of formation have historically been hidden from view.

Illustration of a star cluster forming from the collision of turbulent molecular clouds, which appear as dark shadows in front of the background galactic star field. (NASA/SOFIA/Lynette Cook)

Illustration of a star cluster forming from the collision of turbulent molecular clouds, which appear as dark shadows in front of the background galactic star field. (NASA/SOFIA/Lynette Cook)

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NASA’s Hubble Space Telescope observes Young Red Dwarf Stars Superflares

 

NASA Headquarters

NASA - National Aeronautics and Space AdministrationWashington, D.C. – The word “HAZMAT” describes substances that pose a risk to the environment, or even to life itself. Imagine the term being applied to entire planets, where violent flares from the host star may make worlds uninhabitable by affecting their atmospheres. NASA’s Hubble Space Telescope is observing such stars through a large program called HAZMAT — Habitable Zones and M dwarf Activity across Time.

“M dwarf” is the astronomical term for a red dwarf star — the smallest, most abundant and longest-lived type of star in our galaxy. The HAZMAT program is an ultraviolet survey of red dwarfs at three different ages: young, intermediate, and old.

Violent outbursts of seething gas from young red dwarf stars may make conditions uninhabitable on fledgling planets. In this artist's rendering, an active, young red dwarf (right) is stripping the atmosphere from an orbiting planet (left). Scientists found that flares from the youngest red dwarfs they surveyed — approximately 40 million years old — are 100 to 1,000 times more energetic than when the stars are older. They also detected one of the most intense stellar flares ever observed in ultraviolet light — more energetic than the most powerful flare ever recorded from our Sun.(NASA, ESA and D. Player (STScI))

Violent outbursts of seething gas from young red dwarf stars may make conditions uninhabitable on fledgling planets. In this artist’s rendering, an active, young red dwarf (right) is stripping the atmosphere from an orbiting planet (left). Scientists found that flares from the youngest red dwarfs they surveyed — approximately 40 million years old — are 100 to 1,000 times more energetic than when the stars are older. They also detected one of the most intense stellar flares ever observed in ultraviolet light — more energetic than the most powerful flare ever recorded from our Sun.(NASA, ESA and D. Player (STScI))

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NASA reports Astronomers observe Supermassive Black Hole devour a Star

 

NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – For the first time, astronomers have directly imaged the formation and expansion of a fast-moving jet of material ejected when the powerful gravity of a supermassive black hole ripped apart a star that wandered too close to the massive monster.

The scientists tracked the event with radio and infrared telescopes, including the National Science Foundation’s Very Long Baseline Array (VLBA) and NASA’s Spitzer Space Telescope, in a pair of colliding galaxies called Arp 299.

An artist's concept of a tidal disruption event (TDE) that happens when a star passes fatally close to a supermassive black hole, which reacts by launching a relativistic jet. (Sophia Dagnello, NRAO/AUI/NSF)

An artist’s concept of a tidal disruption event (TDE) that happens when a star passes fatally close to a supermassive black hole, which reacts by launching a relativistic jet. (Sophia Dagnello, NRAO/AUI/NSF)

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NASA’s Hubble Space Telescope used to precisely measure distance to Old Star Cluster

 

Space Telescope Science Institute

NASA - National Aeronautics and Space AdministrationBaltimore, MD – Astronomers using NASA’s Hubble Space Telescope have for the first time precisely measured the distance to one of the oldest objects in the universe, a collection of stars born shortly after the big bang.

This new, refined distance yardstick provides an independent estimate for the age of the universe. The new measurement also will help astronomers improve models of stellar evolution. Star clusters are the key ingredient in stellar models because the stars in each grouping are at the same distance, have the same age, and have the same chemical composition. They therefore constitute a single stellar population to study.

This ancient stellar jewelry box, a globular cluster called NGC 6397, glitters with the light from hundreds of thousands of stars. (NASA, ESA, and T. Brown and S. Casertano (STScI) ; Acknowledgement: NASA, ESA, and J. Anderson (STScI))

This ancient stellar jewelry box, a globular cluster called NGC 6397, glitters with the light from hundreds of thousands of stars. (NASA, ESA, and T. Brown and S. Casertano (STScI) ; Acknowledgement: NASA, ESA, and J. Anderson (STScI))

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