Tag Archives: Milky Way

Astronomy News

Long range sensors detect….

  1. Massive black Hole Discovered
  2. What will the sky look like after Milky Way merges with Andromeda Galaxy?
  3. Charting the place of our sun in the galaxy

Massive Black Hole Discovered

(CNN)Scientists have discovered a “monster black hole” so massive that, in theory, it shouldn’t exist.

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It’s a stellar black hole — the type that forms after stars die, collapse, and explode. Researchers had previously believed that the size limit was no more than 20 times the mass of our sun because as these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds.
This theory has now been toppled by LB-1, the newly-discovered black hole. Located about 15,000 light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.

READ ALL ABOUT! https://www.cnn.com/2019/11/28/asia/china-black-hole-discovery-intl-hnk-scli-scn/index.html

What will the sky look like after Milky Way merges with Andromeda Galaxy? Our galaxy‘s date with destruction

The Milky Way is on a collision course with its neighbor, the Andromeda Galaxy. What will the night sky look like after the crash?
By Abraham Loeb, Thomas Cox
MilkomedaFNL
BILLIONS OF YEARS FROM NOW, the night sky will glow with stars, dust, and gas from two galaxies: the Milky Way, in which we live, and the encroaching Andromeda Galaxy (M31).
Lynette Cook for Astronomy
Our galaxy, the Milky Way, and its nearest large neighbor, the Andromeda Galaxy (M31), are on a collision course. Billions of years from now, the merger will transform the structure of both galaxies and create a new arrangement of stars we have dubbed Milkomeda (“milk-AHM-mee-da”). The merger will radically transform the night sky. But into what?
Currently, the Milky Way’s thin disk of stars and gas appears as a nebulous strip arching across the summer sky. As Andromeda grazes the Milky Way, a second lane of stars will join the one that presently graces the night sky. After the final merger, the stars will no longer be confined to two narrow lanes, but instead scatter across the entire sky.

In our research, we have explored the Milky Way’s fate by simulating Milkomeda’s birth in a supercomputer. The simulations are at a sufficient level of detail to learn a lot about the coming merger and how it will change our perspective on the universe. Although we won’t be here to witness the event — nor to take responsibility for whether our forecast proves accurate — this is the first research in our careers that has a chance of being cited 5 billion years from now.

Lots more to see here!

Charting the sun’s place in our stellar “Neighbourhood”.

Click image to enlarge, Click here to read the article.

Astronomy News

Milky Way’s centre exploded 3.5 million years ago

A cataclysmic energy flare ripped through our galaxy, the Milky Way, about 3.5 million years ago, a team of astronomers say.

The so-called Seyfert flare started near the supermassive black hole in the centre of the galaxy, they add.

The impact was felt 200,000 light-years away.

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Click here to see this video: Media captionArtwork: The massive burst of ionising radiation explodes from our galaxy’s heart

The discovery that the Milky Way’s centre was more dynamic than previously thought can lead to a complete reinterpretation of its evolution.

“These results dramatically change our understanding of the Milky Way,” says co-author Magda Guglielmo from the University of Sydney, Australia.

“We always thought about our galaxy as an inactive galaxy, with a not so bright centre,” she added.

The flare created two enormous “ionisation cones” that sliced through the Milky Way and left its imprint on the Magellanic Stream. This is a long trail of gas that extends from nearby dwarf galaxies called the Large and Small Magellanic Clouds.

The stream lies at an average of 200,000 light-years from the Milky Way.

The Australian-US research team says the explosion was too big to have been triggered by anything other than nuclear activity associated with the supermassive black hole at the centre of our galaxy.

Known as Sagittarius A*, or Sgr A* – this colossus is more than four million times the mass of our Sun. This assessment needs further work but the conclusion seems inescapable, the researchers say.

“The flare must have been a bit like a lighthouse beam,” explained team leader Prof Bland-Hawthorn, who is also at the University of Sydney. “Imagine darkness, and then someone switches on a lighthouse beacon for a brief period of time.”

The research, which used the Hubble Space Telescope, will be published in the Astrophysical Journal.

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