Resposta :
Massa da Terra:
[tex]5972.10^{24}=\\5972.1000000000000000000000000=\\=5972000000000000000000000kg\\[/tex]
Massa do novo planeta:
[tex]3,2.(5972.10^{24})=\\3,2.(5972000000000000000000000)=\\=19110400000000000000000000kg\\[/tex]
Em notação científica: [tex]1,91104.10^{25}[/tex]