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Venus is the only planet in the solar system where the Sun rises in the west and sets in the east.
Comet ATLAS and the Mighty Galaxies via NASA https://ift.tt/2U8fXYg
Little Ghost Nebula
via APOD/NASA; credit: Hubble Heritage Team, NASA
Veil Nebula: Wisps of an Exploded Star
via APOD/NASA; NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
Nearby Spiral Galaxy NGC 4945 via NASA https://ift.tt/2KLnVSm
These are a few of my favorite things nebulae! pt.2
From top to bottom:
NGC 2736 - The Pencil Nebula 30 Doradus - Tarantula Nebula IC 1396 - Emission Nebula in Cepheus M17 - Omega Nebula M42 - Orion Nebula M16 - Eagle Nebula
pt. 1 here!
Hubble Celebrates 29th Anniversary with a Colorful Look at the Southern Crab Nebula
In celebration of the 29th anniversary of the launch of NASA’s Hubble Space Telescope, astronomers captured this festive, colorful look at the tentacled Southern Crab Nebula. The nebula, officially known as Hen 2-104, is located several thousand light-years from Earth in the southern hemisphere constellation of Centaurus. It appears to have two nested hourglass-shaped structures that were sculpted by a whirling pair of stars in a binary system. The duo consists of an aging red giant star and a burned-out star, a white dwarf. The red giant is shedding its outer layers. Some of this ejected material is attracted by the gravity of the companion white dwarf. The result is that both stars are embedded in a flat disk of gas stretching between them. This belt of material constricts the outflow of gas so that it only speeds away above and below the disk. The result is an hourglass-shaped nebula. Read more: go.nasa.gov/2VTveuv Credit: NASA, ESA, and STScI
Hubble’s Lucky Observation of an Enigmatic Cloud : The little-known nebula IRAS 05437+2502 billows out among the bright stars and dark dust clouds that surround it. (via NASA)
Flame and horsehead nebulas in Orion
theilr on Flickr
Comet Lovejoy
NASA’s Fermi Satellite Clocks ‘Cannonball’ Pulsar Speeding Through Space
NASA - Fermi Gamma-ray Space Telescope logo. March 19, 2019 Astronomers found a pulsar hurtling through space at nearly 2.5 million miles an hour — so fast it could travel the distance between Earth and the Moon in just 6 minutes. The discovery was made using NASA’s Fermi Gamma-ray Space Telescope and the National Science Foundation’s Karl G. Jansky Very Large Array (VLA). Pulsars are superdense, rapidly spinning neutron stars left behind when a massive star explodes. This one, dubbed PSR J0002+6216 (J0002 for short), sports a radio-emitting tail pointing directly toward the expanding debris of a recent supernova explosion. “Thanks to its narrow dart-like tail and a fortuitous viewing angle, we can trace this pulsar straight back to its birthplace,” said Frank Schinzel, a scientist at the National Radio Astronomy Observatory (NRAO) in Socorro, New Mexico. “Further study of this object will help us better understand how these explosions are able to ‘kick’ neutron stars to such high speed.”
NASA’s Fermi Satellite Clocks a “Cannonball” Pulsar
Video above: New radio observations combined with 10 years of data from NASA’s Fermi Gamma-ray Space Telescope have revealed a runaway pulsar that escaped the blast wave of the supernova that formed it. Image Credits: NASA’s Goddard Space Flight Center. Schinzel, together with his colleagues Matthew Kerr at the U.S. Naval Research Laboratory in Washington, and NRAO scientists Dale Frail, Urvashi Rau and Sanjay Bhatnagar presented the discovery at the High Energy Astrophysics Division meeting of the American Astronomical Society in Monterey, California. A paper describing the team’s results has been submitted for publication in a future edition of The Astrophysical Journal Letters. Pulsar J0002 was discovered in 2017 by a citizen-science project called Einstein@Home, which uses time on the computers of volunteers to process Fermi gamma-ray data. Thanks to computer processing time collectively exceeding 10,000 years, the project has identified 23 gamma-ray pulsars to date. Located about 6,500 light-years away in the constellation Cassiopeia, J0002 spins 8.7 times a second, producing a pulse of gamma rays with each rotation. The pulsar lies about 53 light-years from the center of a supernova remnant called CTB 1. Its rapid motion through interstellar gas results in shock waves that produce the tail of magnetic energy and accelerated particles detected at radio wavelengths using the VLA. The tail extends 13 light-years and clearly points back to the center of CTB 1.
Image above: CTB 1, seen here in a deep exposure that highlights visible light from hydrogen gas, is the expanding wreckage of a massive star that exploded some 10,000 years ago. The pulsar formed in the center of the collapsing star is moving so fast it has completely exited the faint shell. Image Credit: Scott Rosen. Using Fermi data and a technique called pulsar timing, the team was able to measure how quickly and in what direction the pulsar is moving across our line of sight. “The longer the data set, the more powerful the pulsar timing technique is,” said Kerr. “Fermi’s lovely 10-year data set is essentially what made this measurement possible.” The result supports the idea that the pulsar was kicked into high speed by the supernova responsible for CTB 1, which occurred about 10,000 years ago. J0002 is speeding through space five times faster than the average pulsar, and faster than 99 percent of those with measured speeds. It will eventually escape our galaxy. At first, the supernova’s expanding debris would have moved outward faster than J0002, but over thousands of years the shell’s interaction with interstellar gas produced a drag that gradually slowed this motion. Meanwhile, the pulsar, behaving more like a cannonball, steadily raced through the remnant, escaping it about 5,000 years after the explosion.
Image above: The CTB 1 supernova remnant resembles a ghostly bubble in this image, which combines new 1.5 gigahertz observations from the Very Large Array (VLA) radio telescope (orange, near center) with older observations from the Dominion Radio Astrophysical Observatory’s Canadian Galactic Plane Survey (1.42 gigahertz, magenta and yellow; 408 megahertz, green) and infrared data (blue). The VLA data clearly reveal the straight, glowing trail from pulsar J0002+6216 and the curved rim of the remnant’s shell. CTB 1 is about half a degree across, the apparent size of a full Moon. Image Credits: Composite by Jayanne English, University of Manitoba, using data from NRAO/F. Schinzel et al., DRAO/Canadian Galactic Plane Survey and NASA/IRAS. Exactly how the pulsar was accelerated to such high speed during the supernova explosion remains unclear, and further study of J0002 will help shed light on the process. One possible mechanism involves instabilities in the collapsing star forming a region of dense, slow-moving matter that survives long enough to serve as a “gravitational tugboat,” accelerating the nascent neutron star toward it. The team plans additional observations using the VLA, the National Science Foundation’s Very Long Baseline Array (VLBA) and NASA’s Chandra X-ray Observatory. The National Radio Astronomy Observatory is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc. The Fermi Gamma-ray Space Telescope is an astrophysics and particle physics partnership managed by NASA’s Goddard Space Flight Center in Greenbelt, Maryland. Fermi was developed in collaboration with the U.S. Department of Energy, with important contributions from academic institutions and partners in France, Germany, Italy, Japan, Sweden and the United States. Related links: Karl G. Jansky Very Large Array (VLA): https://science.nrao.edu/facilities/vla Very Long Baseline Array (VLBA): https://public.nrao.edu/telescopes/vlba/ NASA’s Chandra X-ray Observatory: http://chandra.harvard.edu/ Fermi Gamma-Ray Space Telescope: http://www.nasa.gov/mission_pages/GLAST/main/index.html Images (mentioned), Video (mentioned), Text, Credits: NASA/Rob Garner/Goddard Space Flight Center, by Francis Reddy. Best regards, Orbiter.ch Full article
32 years ago yesterday, these fireworks appeared in the sky - the closest supernova since 1604: 1987A
via reddit
Radio galaxy Hercules A , with jets over 1.5 million light-years long
via reddit
The Swirling Core of the Crab Nebula
“At the core of the Crab Nebula lies a city-sized, magnetized neutron star spinning 30 times a second. Known as the Crab Pulsar, it’s actually the rightmost of two bright stars, just below a central swirl in this stunning Hubble snapshot of the nebula’s core. Some three light-years across, the spectacular picture frames the glowing gas, cavities and swirling filaments bathed in an eerie blue light. The blue glow is visible radiation given off by electrons spiraling in a strong magnetic field at nearly the speed of light.” [read more at APOD/NASA]
NASA, ESA; Acknowledgment: J. Hester (ASU), M. Weisskopf (NASA / MSFC)
NGC 7635: The Bubble Nebula
Blown by the wind from a massive star, this interstellar apparition has a surprisingly familiar shape. Cataloged as NGC 7635, it is also known simply as The Bubble Nebula. Although it looks delicate, the 7 light-year diameter bubble offers evidence of violent processes at work. Above and left of the Bubble’s center is a hot, O-type star, several hundred thousand times more luminous and some 45 times more massive than the Sun. A fierce stellar wind and intense radiation from that star has blasted out the structure of glowing gas against denser material in a surrounding molecular cloud. The intriguing Bubble Nebula and associated cloud complex lie a mere 7,100 light-years away toward the boastful constellation Cassiopeia. This sharp, tantalizing view of the cosmic bubble is a composite of Hubble Space Telescope image data from 2016, reprocessed to present the nebula’s intense narrowband emission in an approximate true color scheme. Credit: NASA, ESA, Hubble Heritage Team - Reprocessing by Maksim Kakitsev
NGC 7635: The Bubble Nebula via NASA https://ift.tt/2HBnKIw