The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section and is most easily seen during a lunar eclipse. But the complete cross section is larger than the Moon’s angular size in the stages of an eclipse. Still, this thoughtful composite illustrates the full extent of the circular shadow by utilizing images from both partial and total eclipses passing through different parts of the umbra.
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How to fight it? And moreover, how to prevent it at the first place? This infographic has some helpful answers. As always, it’s all about thinking before doing and taking care of our body before it’s too late.
Dogs can be excellent companions for children when in the hands of a capable owner who knows how to read them. Anyone who has grown up with a dog knows that the love and compassion that they gave to and received from their canine soulmates is like nothing else in the world.
This chart depicts the electromagnetic spectrum, highlighting the X-ray portion. NASA’s NuSTAR and ESA’s XMM-Newton telescope complement each other by seeing different colors of X-ray light. Credit: NASA/JPL-Caltech
Some provide inmates with luxury 5-star accommodation others are lawless ghettos but all 10 of these prisons are rather unusual. Music = Swamp Stomp by Barrie Gledden
Heisenberg’s uncertainty principle tells us that it is impossible to simultaneously measure the position and momentum of a particle with infinite precision. In our everyday lives we virtually never come up against this...