The Universe is swarming with galaxies, billions upon billions as far as the eye can see.
"Quasars are one of the most extreme phenomena in the Universe, and what we see is likely to represent the future of our own Milky Way galaxy when it collides with the Andromeda galaxy in about five billion years,""It's exciting to observe these events and finally understand why they occur – but thankfully Earth won't be anywhere near one of these apocalyptic episodes for quite some time.
. The extreme friction and gravity heat the material to incredible temperatures, making it glow with light across the spectrum. The more material, and the stronger the gravitational field, the more light the material produces.of how fast they can feed; if the material grew any brighter, the outward radiation pressure would exceed the inward pull of gravity, pushing the material back out into space.
In addition, the events that trigger the quasar activity likely take a lot longer than the quasar activity lasts. That means that for every quasar galaxy with signs of the trigger activity, there are many more displaying the same characteristics with any quasar activity yet to commence. They found that a good two-thirds of the quasars in their sample showed signs of being gravitationally disturbed by an encounter with another galaxy. That's three times the rate of gravitational disturbance they found in the non-quasar galaxies – and likely, the researchers said, the lower limit of the true rate of disturbance in quasar galaxies.
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