Heh, heh, this is how I keep things on track. Persistent bugger, aren't I? :wink: One or the other...2 questions need to be answered, though both should be looked up by now...

Tobin Dax:
What do cosmologists use for the "measuring stick" of the size of the universe at any given time? (In other words, what is the size of the universe 5 billion years ago or 7 billion years from now compared to if we want to describe it?) Hopefully that makes sense.

Eroica:
Question: How many elements have been detected in the Sun by spectroscopy?

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Sunset

Die Sonne scheidet hinter dem Gebirge. In alle Täler steigt der Abend nieder
mit seinen Schatten, die voll Kühlung sind.