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5 Unsolved Space Mysteries – The Countdown, Episode 26

The views expressed are those of the author and are not necessarily those of Scientific American.

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Data from the Wilkinson Microwave Anisotropy Probe (WMAP) reveals that only a small fraction of our Universe is ordinary matter (Credit: NASA/WMAP team)


More to Explore:

Life on Mars

Ultra-High-Energy Cosmic Rays

Type 1a Supernovae

Dark Matter

The Fate of the Universe

About the Author: Eric is multimedia journalist and producer who specializes in science and natural history. His work has appeared on the websites of Scientific American, Nature, Nature Medicine, Popular Science, Slate and The New York Times among many others. He is a former video producer & editor for Scientific American. Follow on Twitter @EricROlson.

The views expressed are those of the author and are not necessarily those of Scientific American.

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  1. 1. David Cummings 9:46 pm 07/16/2013

    Excellent episode. Nice job Eric and Sophie. As for other space mysteries, here are a few:
    1. Could there be life in an under-sea ocean on Europa or other moons of Jupiter or Saturn?
    2. How far away is the nearest candidate for an earth-like world and when are we going to identify it?
    3. Since our galaxy is at least 10 billion years old, and even at sub-light speeds an advanced civilization should be able to slowly expand through an appreciable portion of the galaxy in less than a million years (meaning that there has been time for thousands and thousands of such adventurous expansions), where are they? Why can’t we see them or hear them in the distance? Why aren’t they here?

    Link to this
  2. 2. Quinn the Eskimo 10:13 am 08/12/2013

    Wow! in all of SPACE we’re down to 5 unknowns.

    So, then how many planets in Andromeda? Oh, we need more GRANT MONEY. I see.

    Link to this

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