Posts Tagged ‘Universe’

What energy shortage?

August 21, 2013

Energy Distribution of the Universe: Chandra

Most of the Universe is dark. The protons, neutrons and electrons that make up the stars, planets and us represent only a small fraction of the mass and energy of the Universe. The rest is dark and mysterious. X-rays can help reveal the secrets of this darkness. X-ray astrophysics is crucial to our understanding not only of the Universe we see, but the quest to determine the physics of everything.

  • Dark Energy

    At the close of the 20th century, our perception of the Universe was jolted. Instead of slowing down after the Big Bang, the expansion of the Universe was found to be accelerating. Was the cosmic acceleration due to Einstein’s cosmological constant, a mysterious form of “dark energy,” or perhaps a lack of understanding of gravity? The answer is still out there. By studying clusters of galaxies, X-ray astronomy is tackling this question using powerful techniques that are independent of other methods currently being employed or proposed for the future.

  • Dark Matter

    The next chunk of the Universe’s budget is another unknown: dark matter. Of all of the material we know about because we can see its gravitational effects, about 85% is composed of matter that emits no light and is radically different from material found in planets and stars. X-rays can be used to study the effects of dark matter in a variety of astronomical settings, and thus probe the nature of this mysterious substance that pervades the Universe.

 

Idle thoughts: On time and change and states of stasis

October 13, 2012

Idle thoughts:

The riddle of whether change and time are interrelated or independent. And which comes first? Within our cosmos perhaps we have many different states of stasis with paths by which these states can be connected. Our universe could then just be one specific change journey, on one particular path between two states of stasis along an axis of change. Perhaps time begins after change gets going. Where the change journey started with the Big Bang and where the end will be in another state of stasis at the end of time – and the end of change.  

Time and change and states of stasis (pdf)

The Cosmos


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