How Big is the Universe How Big is an Atom? The size of an atom is almost impossible to measure because the Atom contains 20 different particles. Electrons, for instance, …Read More How Big is a Particle? Particles of all different shapes and sizes are less than 0.5 nanometers (µm) Polymeric Particles 0.5µm Metal Particles 0.5µm …Read More How Big is the Brightest Star Sirius is the brightest star in the winter night sky of the ‘Northern Hemisphere’. Sirius is easily confused with Jupiter as …Read More How big is the Universe As a keen astronomer, I am still amazed at how vast and apparently endless the Universe appears to be. NASA …Read More