The Universe is everything we can touch, feel, sense, measure or detect. It includes living things, planets, stars, galaxies, dust clouds, light, and even time. ... The Universe contains billions of galaxies, each containing millions or even trillio...
The Sun is the closest star to Earth and lies about 150 million km (93 million miles) away. The next closest star is hundreds even thousands of times farther, while the farthest galaxies are billions of times more distant. Scientists may never calculate how big the Universe really is.
Our place in space Earth forms part of Solar System, which lies in one of the arms of the Milky Way galaxy. The forms part of a cluster of galaxies, which is one of many galaxy clusters scattered across the Universe.
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Distances in the Universe The distances in space are so big that special units called light year are used to measure them. A light year is the distance light travels in a year-about 9.46 trillion km (5.9 trillion miles).
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Redshift
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The Universe is expanding. We know this because will galaxy clusters are moving apart. Scientists measure a galaxy's speed by studying its light. The light from a galaxy speeding away from Earth is stretched out making them longer and redder. This is called the redshift.
