Space

Stunning New Photo of Andromeda Galaxy Taken by New High-Res Instrument

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To bring up a previous point, scientists do not necessarily assume the universe is infinite. There are a lot of competing theories on whether the universe is finite or infinite, and bound or unbound, etc. It's actually a very active topic. The truth is, we don't know and very likely will never know (barring some kind of discovery that the universe is finite and bound, so one of the galaxies we are viewing out there is actually the Milky Way from a different perspective).

 
If they're outside our solar system, yes. But the world "alien" gets more readers/viewers than the more proper term "extrasolar" normally does. The phrases are redundant when viewed in context, but it's how this stuff is written about.

 
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A Multi-Wavelength View of Radio Galaxy Hercules A. Spectacular jets powered by the gravitational energy of a supermassive black hole in the core of the elliptical galaxy Hercules A illustrate the combined imaging power of two of astronomy's cutting-edge tools, the Hubble Space Telescope's Wide Field Camera 3, and the recently upgraded Karl G. Jansky Very Large Array (VLA) radio telescope in New Mexico. Some two billion light-years away, the yellowish elliptical galaxy in the center of the image appears quite ordinary as seen by Hubble in visible wavelengths of light.

The galaxy is roughly 1,000 times more massive than the Milky Way and harbors a 2.5-billion-solar-mass central black hole that is 1,000 times more massive than the black hole in the Milky Way. But the innocuous-looking galaxy, also known as 3C 348, has long been known as the brightest radio-emitting object in the constellation Hercules. Emitting nearly a billion times more power in radio wavelengths than our Sun, the galaxy is one of the brightest extragalactic radio sources in the entire sky.

The VLA radio data reveal enormous, optically invisible jets that, at one-and-a-half million light-years wide, dwarf the visible galaxy from which they emerge. The jets are very-high-energy plasma beams, subatomic particles and magnetic fields shot at nearly the speed of light from the vicinity of the black hole. The outer portions of both jets show unusual ring-like structures suggesting a history of multiple outbursts from the supermassive black hole at the center of the galaxy. The innermost parts of the jets are not visible because of the extreme velocity of the material, which causes relativistic effects that beam the light away from us. Far from the galaxy, the jets become unstable and break up into the rings and wisps.

(NASA, ESA, S. Baum and C. O'Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team, STScI/AURA)

 
Anyone here into amateur astronomy?

Edit - Oh, I forgot to post this as well. If you're interested in recent news on science in general, including astronomy, this is a great site.

www.phys.org

 
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