The scale of the universe

One of the smallest known particles in the universe is something called a quark. Quarks are very important because they bunch up to make bigger particles called neutrons and protons, and these then make atoms. Atoms are the building blocks of everything. Quarks are about one attometre across, which is one billionth of a billionth of a metre. At the other end of the scale, the Milky Way galaxy is about one zettametre across – one thousand billion billion metres. To explore the size of objects in the universe, try scaleofuniverse.com…

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The Week Junior (Digital) - 1 Issue, 364

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