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Is there really a 13,000-year-old alien probe orbiting the earth? If so, who sent it and why? Is the official explanation of the strange object in the photos true? The Black Knight has been an intriguing mystery for decades, and it may go back even further than that.  Back Story The possible existence of the […]

“Telescopes are in some ways like time machines. They reveal galaxies so far away that their light has taken billions of years to reach us. We in astronomy have an advantage in studying the universe, in that we can actually see the past. We owe our existence to stars, because they make the atoms of […]

A galaxy is a collection of stars, gas, and dust bound together by gravity.  The smallest galaxies may contain only a few hundred thousand stars, while the largest may have hundreds of billions.  Galaxies are spread about by vast distances, separated by (relatively) empty space.  Their diameters may range from hundreds of light years across […]