The Sun, for example, is composed of 74.9% hydrogen and 23.8% helium, leaving less than 2% for all other elements heavier than helium. The composition can vary significantly, mainly depending on the age of the star and whether it was born in the early times of our universe or more recently. Stars typically consist of 70-75% hydrogen, about 25% helium and some heavier trace elements. A plasma is a gas that's so hot that the nuclei and the electrons of the atoms have separated, so it's essentially a hot "soup" that contains positive ions (atom nuclei) and electrons. Stars are massive and luminous spheres of hot plasma.
the astonishing answer can be found in the last paragraph of this article.Ĭontents Introduction Classification of stars The formation of stars Structure of stars Hydrostatic equilibrium Nuclear fusion The death of a star How many stars are in the universe? Introduction The question is: for how long do these 80 million people need to continue counting until they have counted all the known stars in the universe? Try to guess.
In the time you have read the text up to here (15 seconds) they have already counted a total of 1.2 billion different stars - or more than all the stars in the Small Magellanic Cloud, one of the closest galaxies to the Milky Way.
They simultaneously start counting with every single person counting one star every second, so together they can manage to count 80 million stars each second. Here is a nice analogy: let's say 80 million people come together to jointly count all the stars that exist in our known universe. First of all, let's try to get an understanding of how many stars there are in the universe.
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