The reason why bubbles are round is because this is the most efficient shape that the soap film can take for the amount of air trapped inside.
A brown dwarf is a very small, dark object, with a mass less than 1/10 that of the Sun. They are 'failed stars', globules of gas that have shrunk under gravity, but failed to ignite and shine as stars.
For the first time in history, the number of people on the planet aged 60 or over will soon surpass those under 5.
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