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10 June 2012

The Scale of Phobos

You’ve probably heard that Mars has two very small moons, but just how small are they? Maybe this brilliant depiction of Phobos hovering over Grenoble like an alien invader will help put things into perspective.


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11 May 2012

Our Super Moon

You may have heard all the excitement last weekend about the so-called “supermoon”. The gist of it is that the moon’s orbit is not perfectly circular, so its distance from the earth varies slightly. But all the talk of the “SuperMoon” got me thinking and I realized that we were missing a teachable moment. No, the moon being at perihelion is not a big deal, but our Moon is pretty “super”. Let me show you why:


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