March 20, 2012 It wasn't long ago that we thought expansion of the universe was slowing down. Whoops! Science then identified Dark Energy as a force acting against deceleration. The discovery upended cosmology almost overnight.
This image of the galaxy cluster Abell 520 — 2.4 billion light-years away — may challenge some of our basic theories about Dark Matter. It is overlaid with false-color maps showing concentrations of starlight (orange), hot gas (green) and mass (blue). The mass is mostly Dark Matter.
M.J. Jee and A. Mahdavi/NASA/ESA/CFHT/CXO
March 13, 2012 The things we can see in the universe are moving faster than they should be. Why? Is the answer Dark Matter, or a physics we're not yet aware of? Science has made its choice. Only time will tell if the consensus was correct.
March 6, 2012 Left to its own devices it seems the "dark universe" would never be able to make something as remarkable as life. Now that is something to ponder. Perhaps the dark universe makes us matter more than we ever realized.
The Warp in this Spiral Galaxy was probably the result of a cosmic collision with another galaxy.
Hubble Heritage Team (STScI/AURA), C. Conselice (U. Wisconsin/STScI) et al., NASA
March 4, 2012 The exquisite warp seen here is likely caused by interactions with other galaxies. Collisions or "harassment" between galaxies is quite common and may be the most important process shaping galactic evolution.
Spiral galaxy NGC 3190 as seen by the European Southern Observatory's Very Large Telescope.
January 11, 2012 Did time start with the big bang? What's outside the universe? Here are answers to these and other questions you always wanted to ask about the universe.
December 14, 2011 As modern science traces the steps from the big bang to intelligent life, the question of whether we are the rule or the exception leaps to the forefront.
December 6, 2011 Just as we starting to find new worlds beyond our own, we have also developed a new and highly sophisticated understanding of how Earth and its life evolve together. Astrophysicist and commentator Adam Frank says this is no coincidence.
A color composite image of Centaurus A, revealing the lobes and jets emanating from the galaxy's central black hole.
November 2, 2011 Did the universe originate from nothing? In a new NOVA series, Brian Greene will be describing some of the modern scientific views on space and time.
October 25, 2011 How long is long enough when it comes to waiting for a new cosmology? How long will scientists, or everyone else for that matter, wait for an exciting, though speculative, theory to find some basis in experiment?
October 5, 2011 This years Nobel Prize in physics celebrates what is the biggest mystery in physics today. What's causing the cosmic acceleration?
June 2, 2010 Morgan Freeman stopped by TOTN to talk about his new series on the Science Channel, Through the Wormhole.
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