Bible Study Seattle

“And war broke out in heaven: Michael and his angels fought with the dragon; and the dragon and his angels fought,” Revelation 12:7

How can there be war in heaven? Isn’t heaven a perfect place?

“Then the temple of God was opened in heaven, and the ark of His covenant was seen in His temple.” Revelation 11:19

“who serve that which is a copy and shadow of the heavenly things, even as Moses is warned of God when he is about to make the tabernacle: for, See, saith he, that thou make all things according to the pattern that was showed thee in the mount.” Hebrews 8:5-6

There is a Temple in heaven? And the earthly Temple was a copy of the heavenly one? Does that mean that there were sacrifices at the heavenly Temple? Does that mean that there was/is death in heaven? Will the second death be a possibility in heaven?