When I was around 10 years old, my parents bought me a telescope. Although my major adult interests would be in the social sciences, arts and humanities, as a child I had a pronounced affinity for astronomy. Something about those bright celestial objects easily fired the imagination of a schoolboy. Two years after my birth,…
August brings the Perseids: the nights of shooting stars. We lie on our backs and look up, point and count, drinking in the warm summer light to remember later when the skies get colder and the nights are long. Of course, shooting stars aren’t stars at all but meteor showers made of space dust and…
The standard models that physics uses to explain the cosmos have some unresolved issues. If we consider only ordinary matter, for example, galaxies are not heavy enough to prevent them from spinning apart, given how fast they rotate. There is simply not enough matter-based gravity to hold them together. This problem with galaxies is one…
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