356 Posts

pulskosmosu Magnetyczna gwiazda która rozjaśnia nasze dni. Jak? Czytaj na #pulskosmosu. The magnetic star that brightens our days #starts #astronomy #space #sun #universe #heliophysics 1w

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pulskosmosu Słońce dzisiaj wyjątkowo zakręcone #Sun #astronomy #heliophysics 4w

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hikkiparkonen Visit #NASA.gov #Heliophysics #Astrophysics

#BlackHoles
Don't let the name fool you: a black hole is anything but empty space. Rather, it is a great amount of matter packed into a very small area - think of a star ten times more massive than the #Sun squeezed into a sphere approximately the diameter of New York City. The result is a gravitational field so strong that nothing, not even light, can escape. In recent years, NASA instruments have painted a new picture of these strange objects that are, to many, the most fascinating objects in space.

Although the term was not coined until 1967 by Princeton physicist John Wheeler, the idea of an object in space so massive and dense that light could not escape it has been around for centuries. Most famously, black holes were predicted by #Einstein's theory of #general #relativity #GR, which showed that when a massive star dies, it leaves behind a small, dense remnant core. If the core's mass is more than about three times the mass of the Sun, the equations showed, the force of gravity overwhelms all other forces and produces a black hole.

Scientists can't directly observe black holes with telescopes that detect x-rays, light, or other forms of #electromagnetic #radiation. We can, however, infer the presence of black holes and study them by detecting their effect on other matter nearby. If a black hole passes through a cloud of interstellar matter, for example, it will draw matter inward in a process known as #accretion. A similar process can occur if a normal #star passes close to a black hole. In this case, the black hole can tear the star apart as it pulls it toward itself. As the attracted matter accelerates and heats up, it emits x-rays that radiate into space. Recent discoveries offer some tantalizing evidence that black holes have a dramatic influence on the neighborhoods around them - emitting powerful gamma ray bursts, devouring nearby stars, and spurring the growth of new stars in some areas while stalling it in others.

One Star's End is a Black Hole's Beginning
Most black holes form from the remnants of a large star that dies in a #supernova explosion. (Smaller stars become dense neutron stars, which are
2mon
  •   hikkiparkonen not massive enough to trap light.) If the total mass of the star is large enough (about three times the mass of the Sun), it can be proven theoretically that no force can keep the star from collapsing under the influence of #gravity. However, as the star collapses, a strange thing occurs. As the surface of the star nears an imaginary surface called the "#eventhorizon," time on the star slows relative to the time kept by observers far away. When the surface reaches the event horizon, time stands still, and the star can collapse no more - it is a frozen collapsing object.
    Even bigger black holes can result from #stellar collisions. Soon after its launch in December 2004, NASA's #Swift telescope observed the powerful, fleeting flashes of light known as gamma ray bursts. #Chandra and NASA's #Hubble Space Telescope later collected data from the event's "afterglow," and together the observations led astronomers to conclude that the powerful explosions can result when a black hole and a #neutron star collide, producing another black hole.

    Babies and Giants
    Although the basic formation process is understood, one perennial mystery in the science of black holes is that they appear to exist on two radically different size scales. On the one end, there are the countless black holes that are the remnants of massive stars. Peppered throughout the Universe, these "stellar mass" black holes are generally 10 to 24 times as massive as the Sun. Astronomers spot them when another star draws near enough for some of the matter surrounding it to be snared by the black hole's gravity, churning out x-rays in the process. Most stellar black holes, however, lead isolated lives and are impossible to detect. Judging from the number of stars large enough to produce such black holes, however, scientists estimate that there are as many as ten million to a billion such black holes in the #MilkyWay alone.

    On the other end of the size spectrum are the giants known as "supermassive" black holes, which are millions, if not billions, of times as massive as the Sun. #Astronomers believe that supermassive black holes lie at the center of virtually all large galaxies, even our own Milky Way. 2mon
  •   hikkiparkonen Astronomers can detect them by watching for their effects on nearby stars and gas.

    Historically, astronomers have long believed that no mid-sized black holes exist. However, recent evidence from Chandra, XMM-Newton and Hubble strengthens the case that mid-size black holes do exist. One possible mechanism for the formation of supermassive black holes involves a chain reaction of collisions of stars in compact star clusters that results in the buildup of extremely massive stars, which then collapse to form intermediate-mass black holes. The star clusters then sink to the center of the galaxy, where the intermediate-mass black holes merge to form a supermassive black hole.

    Recent Discoveries
    September 23, 2015 Milky Way's Black Hole Shows Signs of Increased Chatter (#Sagittarius A*) September 16, 2015 Funky Light Signal from Colliding Black Holes Explained (PG 1302-102)

    August 27, 2015 Hubble Finds that the Nearest Quasar is Powered by a Double Black Hole

    August 11, 2015 #Oxymoronic Black Hole Provides Clues to Growth (RGG 118)

    August 6, 2015 Hubble Finds Evidence of Galaxy Star Birth Regulated by Black Hole Fountain

    July 10, 2015 #Fermi Sees Record Flare from a Black Hole (3C 279)

    July 9, 2015 A Precocious Black Hole (in CID-947)

    July 9, 2015 Swift Reveals a Black Hole Bull's-Eye (V404 #Cygni)

    June 23, 2015 Chandra Captures X-ray Echoes Pinpointing Distant Neutron Star (Circinus X-1)

    June 20, 2015 NASA Missions Monitor a Waking Black Hole (V404 Cygni)

    June 18, 2015 Hubble Sees the 'Teenage Years' of #Quasars

    June 1, 2015 Chandra Finds Evidence for Serial Black Hole Eruptions (NGC 5813)

    May 28, 2015 Galaxies with Relativistic Jets

    May 27, 2015 Hubble Video Shows Shock Collision Inside Black Hole Jet

    May 14, 2015 #Magnetar Near Supermassive Black Hole Delivers Surprises (SGR 1745-2900)

    April 30, 2015 NASA's Chandra Suggest Black Holes Gorging at Excessive Rates (3 Quasars)

    March 4, 2015 Chandra Finds Cosmic Showers Halt Galaxy Growth (Abell 2597)

    February 25, 2015 Chandra Finds Intriguing Member of Black Hole Family (NGC 2276)

    February 19, 2015 NASA, ESA Telescopes Give Shape to Furious Black Hole Winds (PDS 456)

    January 8, 2015 Will the Real 2mon
  •   hikkiparkonen Monster Black Hole #PleaseStandUp (Arp 299)

    January 5, 2015 Record Breaking Outburst from Milky Way's Black Hole (Sagittarius A*) November 19, 2014 Swift Probes an Exotic Object 'Kicked' Black Hole or Mega Star?

    November 13, 2014 NASA X-ray Telescopes Find Black Hole May be a Neutrino Factory (Sagittarius A*) USA.gov
    ExpectMore.gov
    National Aeronautics and Space Administration NASA Official: Kristen Erickson 2mon
  •   violentirishguy Ok so a star has a specific gravity. Upon its death it collapses and the gravity increases? Why wouldn't it just have the same gravitational attraction? How does condensation increase its gravity? 2mon
  •   violentirishguy If I crush up a piece of paper no matter how hard I squeeze it, it doesnt weigh more than the original piece of paper it was. 2mon

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milkyway_scientists 12/01/2015: Celebrating 20 Years of the Solar and Heliospheric Observatory (SOHO)

After 20 years in space, ESA and NASA’s Solar and Heliospheric Observatory, or SOHO, is still going strong.
Originally launched in 1995 to study the sun and its influence out to the very edges of the solar system, SOHO revolutionized this field of science, known as heliophysics, providing the basis for nearly 5,000 scientific papers. SOHO discovered dynamic solar phenomena such as coronal waves, solar tsunamis and sun quakes, and found an unexpected role as the greatest comet hunter of all time—reaching 3,000 comet discoveries in September 2015.

#soho #nasa #nasabeyond #space #universe #cosmos #cosmiclight #solarsystem #observation #observation #astronomy #astronomia #astrophysics #astrophotography #radiation #sun #sunset #sunspots #sunflare #auroraborealis #satellite #heliophysics
2mon

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tanuchi.cl Vamos por esas 10 antenas biquad a 1420Mhz. ya no hay punto de regreso... #biquad #radioastronomy #fisica #heliofisica #heliophysics 2mon

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emircloner #Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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sunny_days365hina Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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junkyardarts Brain blown. G'night everything. "Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field." Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science #blowingmymind #how #icanteven
3mon
  •   tangyzizzzle Amazing. Did you know that BU and Harvard have midnight astronomy lectures and sessions with their awesome telescopes? Free! I wanna go. This shit is fucking awesome 3mon
  •   junkyardarts Let's do it!! @tangyzizzzle Mark can babysit haha 3mon
  •   tangyzizzzle I think I've accidentally abused any and all babysitting favors from you two ☹️ 3mon
  •   junkyardarts Pft I fell asleep while we watched Netflix. REAL HARD WORK, @tangyzizzzle 3mon

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alyssamalehorn #Repost @nasa
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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cuffeeinabeaker #Repost @nasa with @repostapp
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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edmiguel2 #wow#Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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womenofselflove Morning sun shines... Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.
#selfloveaffair #womenofselflove #sun #mothernature #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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boba_fett25 #Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science #star
3mon

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dotdotdotmusic #Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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starbaseaustin #Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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ferihani Manyetik denizi .... #Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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le_moishe #Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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datachick #Repost @nasa ・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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ghostfacegorilla Amazing... #Repost @nasa with @repostapp.
・・・
Brightening Magnetic Loops: Two active regions sprouted arches of bundled magnetic loops in this video from Our Solar Dynamics Observatory taken on Nov. 11-12, 2015. Charged particles spin along the magnetic field, tracing out bright lines as they emit light in extreme ultraviolet wavelengths. About halfway through the video, a small eruption from the active region near the center causes the coils to rise up and become brighter as the region re-organizes its magnetic field. This video was taken in extreme ultraviolet wavelengths of 171 angstroms, typically invisible to our eyes but colored here in gold.

Credit: NASA/SDO

#nasa #space #sun #solar #weather #spaceweather #sdo #nasabeyond #heliophysics #science
3mon

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