Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
우주에서 적색편이는 먼 은하들이 우리에게 멀어지고 있다는 것을 나타냅니다.ujueso jeoksaekpyeoni neun eunhaduri uriege meoreojigo itdaneun geoseul natanamnida.In the universe, red shift indicates that distant galaxies are moving away from us.