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Interesting things related to physics. For the love of physics. Rate Channel : https://telegram.me/tchannelsbot?start=minutephysics Feedback / ads : @MinutePhysicsBot
#AstronomyImageOfTheDay
This exciting and unfamiliar view of the Orion Nebula
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Stars of the Hyades cluster are scattered through this mosaic spanning over 5 degrees on the sky toward the constellation Taurus.
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Astronomy Term of the Day
Now let us deeply examine where the twist is. An ECO stands for "Eternally Collapsing Object". It is slightly different from black holes in certain aspects. While a true black hole based on General Relativity cannot emit anything, an ECO can. Recently, Chandra Space Telescope made an important observation. It caught a supermassive black hole burping gas. A true black hole has infinite gravitational redshift at the event horizon. This means nothing can escape from a black hole, not even light. Then how come it ejected gas out of it? This observation cannot be clearly explained by a true black hole model, however an ECO model can. Here is the link of the observation:
https://www.rt.com/news/415849-nasa-burping-supermassive-blackhole/
Also if we consider the scenario of ECO to be correct, once the universe is deprived of all the baryonic matter, the Quark Gluon Plasma (QGP) ejected from an ECO can be coagulated to hydrogen than can trigger star formation again. Hence there will be new stars, new galaxies and new ECOs.
When a small star dies, it can form a white dwarf and eject material by planetary nebula. A massive star forms a neutron star that too expels heavy elements by supernova. Similarly very massive stars forms an ECO that withers into the inter galactic medium. Link to research paper:
https://www.academia.edu/1363248/Radiation_Pressure_Supported_Star_As_Quasar_Central_Engine
Last but not the least. Recently Hubble’s Cosmic Origin Spectrograph has found that the circumgalactic medium (CGM) is fed by galaxy outflows and accretion of intergalactic gas. While such outflows must be generated by intense starburst and supernovae activities, there is a net accounting problem at least in some cases (Lehner & Honk 2011):“Without a source of new gas, our Galaxy would exhaust its supply of gas through the formation of stars. Ionized gas clouds observed at high velocity may be a reservoir of such gas, but their distances are key for placing them in the Galactic halo and unraveling their role.”(Lehner & Honk 2011).If all the galaxies in the universe would contain supermassive BHs at their core, in the long run, all recycling activities must slow down. In particular, since the supposed supermassive BHs must be gulping matter,
and nothing can come out of event horizons,the net amount of material available for recycling must steadily be getting diminished.Then how can one expect additional source of new gas?
This problem challenges not only the BH paradigm but the Big Bang paradigm too
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I am ready to put my life on the line because I know physics works
— Walter Lewin
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#AstronomyImageOfTheDay
Rigel and the Witch Head Nebula
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