来自陈滨的问题
Menhavebeeninterestedinthestarseversincetheyfirstlookedupintothesky.someofthesestarsmayhavetheirownplanets.ifthatisso,wecanknowthatlifemayexistoneofthem.theproblemisthattheneareststarisfourlightyearsawa
Menhavebeeninterestedinthestarseversincetheyfirstlookedupintothesky.
someofthesestarsmayhavetheirownplanets.ifthatisso,wecanknowthatlifemayexistoneofthem.theproblemisthattheneareststarisfourlightyearsaway.Inotherwords,lightfromithasbeentravellingforfouryearsbeforeitfinallyreachesus.Maybenobodyfromearthwillevervisitthatstarbecauseitwilltakearocketahundredthousandyearstoreachit.
