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The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... The first stars and galaxies in the Universe will be surrounded by neutral atoms of (mostly)... [+] hydrogen gas, which absorbs the starlight and slows any ejecta. The large masses and high temperatures of these early stars helps ionize the Universe, but until enough heavy elements are formed and recycled into future generations of stars and planets, life and potentially habitable planets are utterly impossible. ... "
" ... The hardest challenge for finding these first galaxies is that there haven't yet been enough stars formed throughout the Universe to ionize all the neutral atoms in intergalactic space. Protons and electrons are still bound to one another, and will remain so until the Universe is flooded with enough sustained ultraviolet light to permanently kick those electrons off of their atoms. ... "
" ... The size, wavelength and temperature/energy scales that correspond to various parts of the ... [+] electromagnetic spectrum. You have to go to higher energies, and shorter wavelengths, to probe the smallest scales. Ultraviolet light is sufficient to ionize atoms, but as the Universe expands, light gets systematically shifted to lower temperatures and longer wavelengths. ... "