meteor bomb
遊星爆弾 (Yuusei Bakudan)
The Meteor Bomb is a type of weapon of mass destruction featured in the Uchuu Senkan Yamato science fiction anime series from the 70s. It also appears in the new Uchuu Senkan Yamato 2199 remake.
It's an artificial radioactive meteorite used by the Gamilas to bomb enemy planets.