Caution! The site can't guarantee, that text has age permission. The site is not recommended, if you are less than 18 years old.
The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... In the years preceding Rosetta, models predicted that cometary material had its origin mainly in the protosolar nebula, quite close to the Sun, says Altwegg. But instead, we find that the material is much older and comets probably formed much further out, she says. And at least part of the material is older than the solar system. ... "