The Cosmic Energy Inventory chart by Markus Pössel, Haus der Astronomie. Click for larger version.
Editor’s Note: Markus Pössel is a theoretical physicist turned astronomical outreach scientist. He is the managing scientist at the Centre for Astronomy Education and Outreach “Haus der Astronomie” in Heidelberg, Germany.
Now that the old year has drawn to a close, it’s traditional to take stock. And why not think big and take stock of everything there is?
Let’s base our inventory on energy. And as Einstein taught us that energy and mass are equivalent, that means automatically taking stock of all the mass that’s in the universe, as well – including all the different forms of matter we might be interested in.
Of course, since the universe might well be infinite in size, we can’t simply add up all the energy. What we’ll do instead is look at fractions: How much of the energy in the universe is in the form of planets? How much is in the form of stars? How much is plasma, or dark matter, or dark energy?
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Read the rest of Guest Post: The Cosmic Energy Inventory (1,798 words)
© nancy for Universe Today, 2012. |
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Post tags: Cosmology, Dark Energy, Dark Matter, Ordinary Matter, Physics
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