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How Far Are the Stars? (part 3)
April 29, 2011 · Be The First To Comment

In my last post, I showed how Cepheid variables allow us measure distances to distant stars and even to other galaxies. However, there is a limit to how far we can measure using Cepheids.  To measure the distance to the farthest galaxies, it takes a standard candle much brighter than a Cepheid. It takes a […]

The Incredible Journey of the Monarchs – on PBS
January 26, 2009 · 10 Comments

photo credit: Randy Son Of Robert What do you know about monarch butterflies? A universal favorite, most people know that these showy orange and black butterflies fly south every year to spend the winter in Mexico. Many of you may have raised their black, yellow, and white caterpillars on Mexican milkweed as a class project […]

Starting Off With a Big Bang – Naturally
April 22, 2008 · Be The First To Comment

photo credit: Eurritimia Well, if another blog must be added to the ever-expanding blogosphere (which might now be growing at a rate similar to that of the universe itself), it makes sense to begin at the beginning of all energy-the “cosmogenesis,” when all matter, time and energy as we know it came into existence, commonly […]



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