In celebration of the 34th anniversary of the launch of NASA's legendary Hubble Space Telescope on April 24, astronomers took a snapshot of the Little Dumbbell Nebula (also known as Messier 76, M76, or NGC 650/651) located 3,400 light-years away in the northern circumpolar constellation Perseus. The photogenic nebula is a favorite target of amateur astronomers.
M76 is classified as a planetary nebula, an expanding shell of glowing gases that were ejected from a dying red giant star. The star eventually collapses to an ultra-dense and hot white dwarf. A planetary nebula is unrelated to planets, but have that name because astronomers in the 1700s using low-power telescopes thought this type of object resembled a planet.
M76 is composed of a ring, seen edge-on as the central bar structure, and two lobes on either opening of the ring. Before the star burned out, it ejected the ring of gas and dust. The ring was probably sculpted by the effects of the star that once had a binary companion star. This sloughed off material created a thick disk of dust and gas along the plane of the companion's orbit. The hypothetical companion star isn't seen in the Hubble image, and so it could have been later swallowed by the central star. The disk would be forensic evidence for that stellar cannibalism.
The primary star is collapsing to form a white dwarf. It is one of the hottest stellar remnants known at a scorching 250,000 degrees Fahrenheit, 24 times our Sun's surface temperature.
The sizzling white dwarf can be seen as a pinpoint in the center of the nebula. A star visible in projection beneath it is not part of the nebula.
Pinched off by the disk, two lobes of hot gas are escaping from the top and bottom of the "belt," along the star's rotation axis that is perpendicular to the disk. They are being propelled by the hurricane-like outflow of material from the dying star, tearing across space at two million miles per hour. That's fast enough to travel from Earth to the Moon in a little over seven minutes! This torrential "stellar wind" is plowing into cooler, slower-moving gas that was ejected at an earlier stage in the star's life, when it was a red giant. Ferocious ultraviolet radiation from the super-hot star is causing the gases to glow. The red color is from nitrogen, and blue is from oxygen.
Given our solar system is 4.6 billion years old, the entire nebula is a flash in the pan by cosmological timekeeping. It will vanish in about 15,000 years.
Hubble's Star Trekking
Since its launch in 1990 Hubble has made 1.6 million observations of over 53,000 astronomical objects. To date, the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute in Baltimore, Maryland holds 184 terabytes of processed data that is science-ready for astronomers around the world to use for research and analysis. Since 1990, 44,000 science papers have been published from Hubble observations. The space telescope is the most scientifically productive space astrophysics mission in NASA history. The demand for using Hubble is so high it is currently oversubscribed by a factor of six-to-one.
Most of Hubble's discoveries were not anticipated before launch, such as supermassive black holes, the atmospheres of exoplanets, gravitational lensing by dark matter, the presence of dark energy, and the abundance of planet formation among stars.
Hubble will continue research in those domains and capitalize on its unique ultraviolet-light capability on such topics as solar system phenomena, supernovae outbursts, composition of exoplanet atmospheres, and dynamic emission from galaxies. And Hubble investigations continue to benefit from its long baseline of observations of solar system objects, stellar variable phenomena and other exotic astrophysics of the cosmos.
NASA's James Webb Space Telescope was designed to be meant to be complementary to Hubble, and not a substitute. Future Hubble research also will take advantage of the opportunity for synergies with Webb, which observes the universe in infrared light. The combined wavelength coverage of the two space telescopes expands on groundbreaking research in such areas as protostellar disks, exoplanet composition, unusual supernovae, cores of galaxies and chemistry of the distant universe.
The Hubble Space Telescope has been operating for over three decades and continues to make ground-breaking discoveries that shape our fundamental understanding of the universe. Hubble is a project of international cooperation between NASA and ESA (European Space Agency). NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope and mission operations. Lockheed Martin Space, based in Denver, Colorado, also supports mission operations at Goddard. The Space Telescope Science Institute in Baltimore, Maryland, which is operated by the Association of Universities for Research in Astronomy, conducts Hubble science operations for NASA.
Image credit: NASA, ESA, STScI
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This new Hubble Space Telescope picture of the nebula NGC 1333 offers a peek into the chaotic and messy star-formation process. It shows that stars are not born in isolation but in batches. They are built from cold interstellar hydrogen that is laced with soot-like dust. Veils of dust block much of the Hubble Space Telescope’s view into the stellar cauldron. But young bright stars do poke out, like seeing sunlight pierce through clouds on a largely overcast day. Peering deep down inside, Hubble catches a glimpse of a fiery mosh pit of stars putting on their own fireworks show by blasting out jets of hot gas that look like July 4th Roman candles.
This photo was taken in celebration of the 33rd anniversary of the launch of the Hubble Space Telescope.
Credit: NASA, ESA, STScI; Image Processing
Varun Bajaj (STScI), Joseph DePasquale (STScI), Jennifer Mack (STScI)
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This spectacular Hubble Space Telescope image shows a region called G35.2-0.7N, which is known as a hotbed of high-mass star formation. The kind of stars that form here are so massive that they will end their lives as destructive supernovae. However, even as they form they greatly impact their surroundings. At least one B-type star — the second most massive type — lurks within the region pictured here, and a powerful protostellar jet that it is launching towards us is the source of the spectacular light show.
Much of the nebula is dark, with light being blocked from Hubble’s view by the rich dust clouds that produce these massive stars. Near the very center can be seen the location of the star and the jet of material it is emitting. The small, bright orange streak there is a cavity in the dust carved out by the ferocity of the jet as it streams towards us. By breaking through its dusty cocoon, the jet reveals light from the protostar, but there is still so much dust that the light is “reddened” to a fiery orange. The massive protostar lies at the very lower-left tip of this cavity.
Credit: ESA/Hubble & NASA, R. Fedriani, J. Tan
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In honor of the fall foliage season, this image from the Hubble Space Telescope features a scene in red. It reveals a small region of the nebula Westerhout 5, which lies about 7,000 light-years from Earth. Suffused with bright red light, this luminous image hosts a variety of interesting features, including a free-floating Evaporating Gaseous Globule (frEGG). The frEGG in this image is the small tadpole-shaped dark region in the upper center-left. This buoyant-looking bubble is lumbered with two names – [KAG2008] globule 13 and J025838.6+604259.
FrEGGs are a particular class of Evaporating Gaseous Globules (EGGs). Both frEGGs and EGGs are denser regions of gas that photoevaporate less easily than the less dense gas surrounding them. Photoevaporation occurs when gas is ionized and dispersed away by an intense source of radiation – typically young, hot stars releasing vast amounts of ultraviolet (UV) light. EGGs were identified fairly recently, most notably at the tips of the iconic Pillars of Creation captured by Hubble in 1995. FrEGGs were classified even more recently and are distinguished from EGGs because they are detached and have a distinct ‘head-tail’ shape. FrEGGs and EGGs are of particular interest because their density makes it more difficult for intense UV radiation, found in regions rich in young stars, to penetrate them. Their relative opacity means that the gas within them is protected from ionization and photoevaporation. Astronomers think this is important for the formation of protostars, and that many FrEGGs and EGGs play host to the birth of new stars.
Credit: ESA/Hubble & NASA, R. Sahai
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A shroud of thick gas and dust surrounds a bright young star in this image from the Hubble Space Telescope. Hubble’s Wide Field Camera 3 inspected a young stellar object, over 9,000 light-years away in the constellation Taurus, to help astronomers understand the earliest stages in the lives of massive stars. This object – which is known to astronomers as IRAS 05506+2414 – may be an example of an explosive event caused by the disruption of a massive young star system.
The swirling discs of material surrounding a young star are usually funneled into twin outflows of gas and dust from the star. In the case of IRAS 05506+2414, however, a fan-like spray of material traveling at velocities of up to 217 miles per second (350 km per second) is spreading outwards from the center of this image.
Astronomers turned to Hubble’s Wide Field Camera 3 to measure the distance to IRAS 05506+2414. While it is possible to measure the velocity of material speeding outward from the star, astronomers cannot tell how far from Earth the star actually is from a single observation. To determine the star’s distance, they measured how far the outflow travels between successive images. From there they could infer the distance to IRAS 05506+2414. Knowing its distance allows astronomers to determine how bright the star is and how much energy it is emitting, and therefore estimate its mass – all vital information in determining the origin of this bright young star’s unusual outflow.
Credit: ESA/Hubble & NASA, R. Sahai
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