Thought for the month

“You know," said Arthur, "it's at times like this, when I'm trapped in a Vogon airlock with a man from Betelgeuse, and about to die of asphyxiation in deep space that I really wish I'd listened to what my mother told me when I was young." "Why, what did she tell you?" "I don't know, I didn't listen.” From The Hitchhiker's Guide to the Galaxy, Douglas Adams, Author (1952-2001)

Wednesday, 6 June 2018

73 or 67?

The European Space Agency’s Gaia mission has produced the richest star catalogue to date, with measurements of nearly 1.7 billion stars. Analysis of the data from the pulse rates of Cepheid stars, has suggested that the universe is expanding faster than previously thought. The new data puts the Hubble constant at 73, which translates into galaxies moving away from us 73km per second faster for each additional megaparsec of distance between us and them. Estimates based on the cosmic microwave background have a value of 67.

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