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The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... Distant sources of light – from galaxies, quasars, and even the cosmic microwave background – must... [+] pass through clouds of gas. The absorption features we see enable us to measure many features about the intervening gas clouds, including the abundances of the light elements inside. ... "
" ... The farther away we look, the closer in time we travel back towards the Big Bang. The latest ... [+] record-holder for quasars comes from a time when the Universe was just 670 million years old, revealing a black hole of 1.6 billion solar masses. These ultra-distant cosmological probes show us a Universe that contains dark matter and dark energy, but we do not understand how these black holes grow so large so fast. ... "