From: BBC NEWS
Our galaxy, the Milky Way, is “warped and twisted” and not flat as previously thought, new research shows.
Analysis of the brightest stars in the galaxy shows that they do not lie on a flat plane as shown in academic texts and popular science books.
Astronomers from Warsaw University speculate that it might have been bent out of shape by past interactions with nearby galaxies.
The new three dimensional map has been published in the journal Science.
The popular picture of the Milky Way as a flat disc is based on the observation of 2.5 million stars out of a possible 2.5 billion. The artists’ impressions are therefore rough approximations of the truer shape of our galaxy, according to Dr Dorota Skowron of Warsaw University.
“The internal structure and history of the Milky Way is still far from being understood, in part because it is extremely difficult to measure distances to stars at the outer regions of our galaxy,” she said.
From BBC NEWS
Astronomers have taken the first ever image of a black hole, which is located in a distant galaxy.
It measures 40 billion km across – three million times the size of the Earth – and has been described by scientists as “a monster”.
The black hole is 500 million trillion km away and was photographed by a network of eight telescopes across the world.
Details have been published today in Astrophysical Journal Letters.
Prof Heino Falcke, of Radboud University in the Netherlands, who proposed the experiment, told BBC News that the black hole was found in a galaxy called M87.
“What we see is larger than the size of our entire Solar System,” he said.
“It has a mass 6.5 billion times that of the Sun. And it is one of the heaviest black holes that we think exist. It is an absolute monster, the heavyweight champion of black holes in the Universe.”
The image shows a intensely bright “ring of fire”, as Prof Falcke describes it, surrounding a perfectly circular dark hole. The bright halo is caused by superheated gas falling into the hole. The light is brighter than all the billions of other stars in the galaxy combined – which is why it can be seen at such distance from Earth.
Image: EHT Collaboration
From BBC News:
Astronomers have revealed details of mysterious signals emanating from a distant galaxy, picked up by a telescope in Canada.
The precise nature and origin of the blasts of radio waves is unknown.
Among the 13 fast radio bursts, known as FRBs, was a very unusual repeating signal, coming from the same source about 1.5 billion light years away.
Such an event has only been reported once before, by a different telescope.
“Knowing that there is another suggests that there could be more out there,” said Ingrid Stairs, an astrophysicist from the University of British Columbia (UBC).
“And with more repeaters and more sources available for study, we may be able to understand these cosmic puzzles – where they’re from and what causes them.”
The CHIME observatory, located in British Columbia’s Okanagan Valley, consists of four 100-metre-long, semi-cylindrical antennas, which scan the entire northern sky each day.
The telescope only got up and running last year, detecting 13 of the radio bursts almost immediately, including the repeater.
YouTube channel SpaceTime has been running an excellent series on String Theory and explains, in simplistic-yet-detailed language, what it is and how it’s taken the science world by storm over the past thirty years.
Also (for some reason WordPress are not allowing me to embed more than one video) How to Detect Extra Dimensions, Why String Theory is Right and Why String Theory is Wrong.
My favourite YouTube channel just got even better. New series.
From Science Alert...
The US National Science Foundation (NSF) is hosting an announcement today to reveal exciting findings from its IceCube observatory at the South Pole. At 11am EDT (3pm GMT) today, they’ll be streaming live from the NSF headquarters in Virginia, as scientists discuss a groundbreaking discovery in astronomy. The NSF said that the announcement concerns “multi-messenger astrophysics findings” from IceCube.
More than 20 observatories took part in the research, and leading astrophysicists from these will be present at the event. Aside from that, no other details have been revealed.
A new report in The Astrophysical Journal claims that two stars may have just collided to create a black hole. If this is true, it may radically alter our understanding of how these super structures are formed. The alternative is potentially just as crazy sounding, that two neutron stars can fuse. Either way, something very […]
via Colliding Stars May Create Black Holes. Something Weird Is Happening In The Cosmos. — Science Can Change Your World
Original story via MOTHERBOARD
Thanks to gravitational lensing, astronomers can observe normal stars across colossal stretches of space and time.
Nine billion light years is a practically unfathomable distance, but astronomers have managed to peer across this vast expanse of spacetime to capture images of a single “normal” star (meaning that it is not currently going through a supernova).
This far-flung star, nicknamed “Icarus” though it is officially called MACS J1149 Lensed Star 1, is the most distant non-exploding star ever observed by humans, according to new research published Monday in Nature Astronomy. The paper’s first author, University of Minnesota astronomer Patrick Kelly, said in a statement the star is “at least 100 times farther away than the next individual star we can study, except for supernova explosions.”
ARTICLE VIA BBC NEWS
World renowned physicist Stephen Hawking has died at the age of 76.
He died peacefully at his home in Cambridge in the early hours of Wednesday, his family said.
The British scientist was famed for his work with black holes and relativity, and wrote several popular science books including A Brief History of Time.
At the age of 22 Prof Hawking was given only a few years to live after being diagnosed with a rare form of motor neurone disease.
The illness left him in a wheelchair and largely unable to speak except through a voice synthesiser.
In a statement his children, Lucy, Robert and Tim, said: “We are deeply saddened that our beloved father passed away today.
“He was a great scientist and an extraordinary man whose work and legacy will live on for many years.”
They praised his “courage and persistence” and said his “brilliance and humour” inspired people across the world.
“He once said, ‘It would not be much of a universe if it wasn’t home to the people you love.’ We will miss him forever.”
A book of condolence has been opened at Gonville and Caius College in Cambridge, where Prof Hawking was a fellow.
Original Post from Inside Science
Signal hints at possible interactions between ordinary hydrogen and dark matter in the early universe, but some scientists remain skeptical.
(Inside Science) — After spending nearly two decades listening to the skies with radio telescopes, astronomers have finally detected a long-sought-after and subtle signal from the early universe. A group of scientists claim to have found a sign of radiation from the very first generation of stars, only about 180 million years after the Big Bang — just a blink of an eye to the cosmos.
“Other than the cosmic microwave background radiation, this is the earliest observation of any kind in the universe. Compare it to Hubble looking at the first galaxies at 400 million years old; we’re looking at a time roughly half that age,” said Judd Bowman, a cosmologist at Arizona State University in Tempe, Arizona and lead author of the research, published today in the journal Nature.
During an era known as the “cosmic dawn,” the first stars were forged from primordial hydrogen and helium gas. Their ultraviolet light reached free hydrogen gas in the surrounding regions, interacting with the atoms in a way that left a key signature in the radio spectrum from the afterglow of the Big Bang. Looking for signatures like this helps astronomers probe the early moments of the universe when it was first beginning to form its structure.
Artist’s rendering of how the first stars in the universe may have looked.
Image credits: N.R. Fuller, National Science Foundation