The Scale of the Universe 2
We are small, but perfectly formed. The latest version of the Scale of the Universe.
Previously on Dangerous Minds
We are small, but perfectly formed. The latest version of the Scale of the Universe.
Previously on Dangerous Minds
Via GOOD:
We’ve brought you the interstate highways as a subway map, and now here is the galaxy. In case you were confused how to get from here to, say Cygnus, this will help you out. Just take the red line to the blue line and hop on the express. For all the jokes, we know those stars are out there, but have no idea how they relate to each other spatially, and this goes a long way toward making the universe a little more understandable.
New Scientist reports that there is some huge freaking thing at the edge of our universe that has been labeled “dark flow.” I just… just… DEAR GOD I HOPE IT’S NOT GALACTUS.
Something big is out there beyond the visible edge of our universe. That’s the conclusion of the largest analysis to date of over 1000 galaxy clusters streaming in one direction at blistering speeds. Some researchers say this so-called “dark flow” is a sign that other universes nestle next door.
Last year, Sasha Kashlinsky of the Goddard Space Flight Center in Greenbelt, Maryland, and colleagues identified an unusual pattern in the motion of around 800 galaxy clusters. They studied the clusters’ motion in the “afterglow” of the big bang, as measured by the Wilkinson Microwave Anisotropy Probe (WMAP). The photons of this afterglow collide with electrons in galaxy clusters as they travel across space to the Earth, and this subtly changes the afterglow’s temperature.
The team combined the WMAP data with X-ray observations and found the clusters were streaming at up to 1000 kilometres per second towards one particular part of the cosmos (The Astrophysical Journal Letters, vol 686, p L49).
Many researchers argued the dark flow would not turn up in later observations, but now the team claim to have confirmed its existence. Their latest analysis reveals 1400 clusters are part of the flow, and that it continues to around 3 billion light years from Earth, a sizeable fraction of the distance to the edge of the observable universe (arxiv.org/abs/0910.4958). This is twice as far as seen in the previous study.
The dark flow appears to have been caused shortly after the big bang by something no longer in the observable universe. It has no effect today because reaching across this horizon would involve travelling faster than light.
While the rest of the world freaks out about swine flu shots and the new 2012 movie, I will be hiding under the bed from the Smasher of Universes Who Wields the Power Cosmic, thank you very much.