The universe is big - really big. Just our Milky Way galaxy alone is about 300 billion stars, with planets whizzing around them and clouds of gas and dust floating in between.
Then there is our orbiting companion, the Andromeda Galaxy and a small group of galaxies in our Local Group, which is about 3 million light years across.
What is in the vast unknown remains a mystery but a recent paper shed light on our immediate neighborhood - bright galaxies within 35-million light years of the Earth.
"All bright galaxies within 20 million light years, including us, are organized in a 'Local Sheet' 34-million light years across and only 1.5-million light years thick" said Professor Marshall McCall of York University, Canada. "The Milky Way and Andromeda are encircled by twelve large galaxies arranged in a ring about 24-million light years across – this 'Council of Giants' stands in gravitational judgment of the Local Group by restricting its range of influence."
The brightest galaxies within 20 million light years of the Milky Way, as seen from above. The largest galaxies, here shown in yellow at different points around the dotted line, make up the ‘Council of Giants’. Credit: Marshall McCall / York University.
Side view of the brightest galaxies within 20 million light years of the Milky Way. Credit: Marshall McCall / York University.
McCall says twelve of the fourteen giants in the Local Sheet, including the Milky Way and Andromeda, are "spiral galaxies" which have highly flattened disks in which stars are forming. The remaining two are more puffy "elliptical galaxies", whose stellar bulks were laid down long ago. Intriguingly, the two ellipticals sit on opposite sides of the Council. Winds expelled in the earliest phases of their development might have shepherded gas towards the Local Group, thereby helping to build the disks of the Milky Way and Andromeda.
McCall also examined how galaxies in the Council are spinning. He comments: "Thinking of a galaxy as a screw in a piece of wood, the direction of spin can be described as the direction the screw would move (in or out) if it were turned the same way as the galaxy rotates. Unexpectedly, the spin directions of Council giants are arranged around a small circle on the sky. This unusual alignment might have been set up by gravitational torques imposed by the Milky Way and Andromeda when the universe was smaller."
The boundary defined by the Council has led to insights about the conditions which led to the formation of the Milky Way. Most importantly, only a very small enhancement in the density of matter in the universe appears to have been required to produce the Local Group. To arrive at such an orderly arrangement as the Local Sheet and its Council, it seems that nearby galaxies must have developed within a pre-existing sheet-like foundation comprised primarily of dark matter.
"Recent surveys of the more distant universe have revealed that galaxies lie in sheets and filaments with large regions of empty space called voids in between" says McCall. "The geometry is like that of a sponge. What the new map reveals is that structure akin to that seen on large scales extends down to the smallest."
Citation: Marshall L. McCall, 'A Council of Giants', MNRAS May 01, 2014 440 (1): 405-426. doi: 10.1093/mnras/stu199
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- What May Be Missing From Quantum Computing - A Quantum Middle Man
- Math, Time and Obesity
- Almost One In Three US Adults Owns A Gun But Murder Rates Have Plummeted
- Patients With Recurrent Depression Have Smaller Hippocampi
- Radiation Detectors Click By Design
- Obese Teens Are Less Likely To Use Contraception
- Lexus Hoverboard Gets Off The Ground
- "The chart (and the framing by the underlying statstics) is making more of an evangelical case than..."
- "For the data, see Richardson EG1, Hemenway D. 2011: Homicide, suicide, and unintentional firearm..."
- "Hello IR,if you apply to one of the positions we'll open next month (5 or 6 if I'm not mistaken)..."
- "Nice and pedagogic explanation. But check that in the last paragraph, it should be 100 times less..."
- "Why does special relativity work? Does it? Take a look: DOI: 10.13140/RG.2.1.3461.7763/1 ..."