Planetbusters

A term used to refer to a character, weapon, or entity that can destroy a planet. By "destroy", it is usually meant to scatter the planet's mass beyond the limits of gravitational attraction. Planetbusters are generally considered to be the type of characters that can easily solo most other universes, such as the members of the Holy Shonen Trinity as well as most other single planet universes.

Characters that can destroy stars/star systems, galaxies, or universes are usually not referred to as planetbusters, since that would be like calling a H-bomb a "buildingbuster".

The term "planetbuster" is somewhat of a misnomer, since there are many different types of planets that come in many different sizes and masses. As it is used in the OBD, it generally refers to the ability to destroy at least an earth-sized planet of the same mass. As it happens, there is a formula for determining how much energy is required to scatter a body beyond the power of gravity to pull it back together. For the earth, that amount of energy is at the minimum 2.24xE32 joules.

To give you some idea of how absurd that is: Tsar Bomba, the largest nuke ever detonated, had 50 megatons of explosive power. If we wanted to destroy earth, it would take approximately 1 quadrillion Tsar Bombas, at the bare minimum.

For reasons described above, there are three general categories of planet busting. The first has been described above: destroying Earth, which would require energy of about 57.3 zettatons. However Earth is not the only kind of planet out there. To differentiate somewhat, there are two other categories of planet busting.

Small:  Equivalent to destroying Mercury, the smallest planet in the solar system. This would require energy of around 433 exatons.

Large:  This describes the ability to destroy large gas giant planets. The benchmark for this is 2.7 yottatons - the energy required to destroy Uranus, the least massive gas giant in the solar system.