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Tag Archives: gravity


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The Moon is Earth’s only natural satellite, circling the planet at an average distance of roughly 385,000 kilometers (239,000 miles).  With a diameter of just under 3,500 kilometers (about 2,160 miles), the cratered surface of the rocky object is one Read more…


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There’s no doubt that modern science owes the 17th century English polymath Sir Isaac Newton some gratitude. You don’t get a whole unit of force named after you for nothing. But if you’re feeling guilty that your time in isolation Read more…


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Albert Einstein’s theory of general relativity profoundly changed our thinking about fundamental concepts in physics, such as space and time. But it also left us with some deep mysteries.   One was black holes, which were only unequivocally detected over Read more…


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We may not know what dark matter is, but scientists now have a better idea of what to look for. Based on quantum gravity, physicists have worked out new, much more stringent upper and lower mass limits of dark matter Read more…


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Every now and again, we get a little glimpse of just how far human ingenuity has gone. Quite literally: The above image was taken by a spacecraft travelling through the Solar System while it was at a distance of 251 Read more…

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