How Big is the Universe

The size of an atom is almost impossible to measure because the Atom contains 20 different particles. Electrons, for instance, …
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Particles of all different shapes and sizes are less than 0.5 nanometers (µm)

Sirius is the brightest star in the winter night sky of the ‘Northern Hemisphere’. Sirius is easily confused with Jupiter as …
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As a keen astronomer, I am still amazed at how vast and apparently endless the Universe appears to be. NASA …
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