“Detected” — Massive Star Formation and Missing Supernova Relics of the Milky Way

 

Glostar Image

 

A new view of star formation in our home galaxy has revealed some previously hidden secrets. Astronomers using two of the world’s most powerful radio telescopes have made a detailed and sensitive survey of a large segment of the Milky Way, detecting previously unseen tracers of massive star formation, a process that dominates galactic ecosystems and solving the mystery of the galaxy’s missing supernova remnants. 

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“Extraterrestrial” –Discovery of Alien Isotope Prompts Rethink of Origins of Elements on Earth

     Pair-Instability Supernova

 

The first-ever discovery of an extraterrestrial radioactive isotope on Earth has scientists rethinking the origins of the elements on our planet. The tiny traces of plutonium-244 (Pu-244) were found in ocean crust alongside radioactive iron-60. The two isotopes are evidence of violent cosmic events in the vicinity of Earth millions of years ago.

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Hubble Space Telescope–“Witnessing a Gargantuan Star’s Utter Destruction” 

 

blue variable star AG Carinae

 

“I like studying these kinds of stars because I am fascinated by their instability. They are doing something weird,” said Kerstin Weis, a luminous blue variable expert at Ruhr University in Bochum, Germany. The Hubble Space Telescope recently captured the nebulosity surrounding the rare luminous blue variable star AG Carinae pictured above. Less than 50 luminous blue variables are known to exist among our local group of neighboring galaxies.

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Titanic Explosion in Andromeda –A Prelude?

 

Andromeda Galaxy

 

So far, we have had only close calls from gamma ray explosions so large, scientists have suggested, that if they occurred within our solar neighborhood (less than 1,000 light years) they could potentially trigger mass extinctions on Earth. 

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“New Cosmic Beast”–A Mysterious Cataclysm Observed

 

The Camel

 

“Somewhere,” said Carl Sagan, “something incredible is waiting to be known” –“I’ve never seen anything like this before in the local universe,” said Stephen Smartt, an astrophysicist at Queen’s University Belfast and a lead scientist for the Hawaii-based ATLAS survey, about “something incredible” –a mysterious cataclysm in a neighboring galaxy that rocked the world’s astronomy community with its discovery on June 16, 2018.

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Pulsing Supergiant Betelgeuse Discovered Closer to Earth –“May Someday Collapse into a Black hole or Neutron Star”

Betelgeuse-

 

Seething supergiant Betelgeuse –a star so huge it could someday collapse into a black hole or neutron star, which would make it the closest black hole to Earth some 725 light-years distant– has displayed unprecedentedly large drop in its brightness in early 2020, prompting speculation that the pulsing may be a dire prelude. A new study by an international team of scientists concluded that the star is in the early core helium-burning phase (more than 100,000 years before a supernova event) and has smaller mass and radius–and is closer to Earth–than previously thought. If the bright-red object  replaced the Sun at the center of our solar system, its outer surface would extend past the orbit of Jupiter.

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