What is the universe made of? ...
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Answer:
The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.
Answer:
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Step-by-step explanation:
Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.
As humbling as it sounds, normal matter almost certainly accounts for the smallest proportion of the Universe, somewhere between 1% and 10%.
In the currently popular model of the Universe, 70% is thought to be dark energy, 25% dark matter and 5% normal matter. But ESA’s X-ray observatory, XMM-Newton, has returned new data about this content. XMM-Newton has found puzzling differences between today’s clusters of galaxies and those in the Universe around seven thousand million years ago.
Some scientists interpret this to mean that the ‘dark energy’ which most astronomers now believe dominates the Universe simply does not exist.
Clusters of galaxies emit lots of X-rays because they contain a large quantity of high-temperature gas. By measuring the quantity of X-rays from a cluster, astronomers can work out both the temperature of the cluster gas and also the mass of the cluster.