3 · en
Short, simple sentences with “nebulae”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
The basic composition of these sidereal clouds called nebulae is: hydrogen and helium for the most part, with infinitesimal parts of carbon, oxygen, calcium, sodium and nitrogen.
Although the average density of nebulae is so low that a vacuum resembling it has not been achieved on Earth, the sum total of this scattered matter in the Milky Way would be enough to build about ten thousand stars.
The most accurate knowledge about nebulae has only come from spectroscopy, a method of breaking down light and photographing the wavelengths - the colours - that make up the light. The dark lines that may appear signify an absorption by some chemical element. As each element absorbs a certain frequency, we know what nebulae are made of.
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