From long ago, by an established tradition that can be traced to the hypothesis of immanuel kant and the marquis de laplace, astronomers have assumed that stars develop out of a scattered, diffuse medium of gas and dust . 很長(zhǎng)時(shí)間以來,天文學(xué)家承襲了可以追溯至康德和拉普拉斯假說所建立的概念,認(rèn)為恒星由散布在空中的彌漫氣塵物質(zhì)演變而來。