[Image credit: C. Henze/NASA Ames Research Center]

The announcement of gravitational wave detection has made me decide to postpone the second part of the presentation of Peter van Inwagen’s paper that I began in my previous post.

I was very pleased and excited to hear the news from LIGO last week: the first direct detection of gravitational waves. These waves are sometimes called waves in spacetime itself, though one can equally well regard them as waves in a gravity field which extends throughout spacetime. However you see it, their detection opens up a new era in astronomy. In a loose comparison, it is as if up to now we have been able to see the universe, and now we are beginning to be able to hear it too.

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