Comets are (binary) asteroids evidence

Observation and discovery of a binary asteroid system that also are classed as comets.

two asteroids orbiting each other and exhibiting comet-like features, including a bright coma and a long tail. This is the first known binary asteroid also classified as a comet.
Hubble discovers a unique type of object in the Solar System |

Asteroids and main belt asteroids can change to become comet like. Or comets are just a variation of asteroids.

NASA’s Hubble Space Telescope helped an international team of astronomers find that an unusual object in the asteroid belt is, in fact, two asteroids orbiting each other that have comet-like features. These include a bright halo of material, called a coma, and a long tail of dust.
Comet or Asteroid? Hubble Discovers that a Unique Object is a Binary | NASA

As previously predicted by the Electric Universe theory of the group including Wallace Thornhill.

asteroids are comets evidence

The images of 288P, which is located in the asteroid belt between Mars and Jupiter, revealed that it was actually not a single object, but two asteroids of almost the same mass and size, orbiting each other at a distance of about 100 kilometres. That discovery was in itself an important find; because they orbit each other, the masses of the objects in such systems can be measured.

But the observations also revealed ongoing activity in the binary system. "We detected strong indications of the sublimation of water ice due to the increased solar heating—similar to how the tail of a comet is created," explains Jessica Agarwal (Max Planck Institute for Solar System Research, Germany), the team leader and main author of the research paper. This makes 288P the first known binary asteroid that is also classified as a main-belt comet.
Hubble discovers a unique type of object in the Solar System |

Evidence that comets are electric asteroids

active asteroids are comets evidenceElectric Universe theory suggests that comets are just electrically active asteroids. Also why asteroids and comets look physically the same, although one is supposedly rock and the other dirty ice balls.

Asteroids normally remain in the main asteroid belts, their orbits remaining stable and therefore their electrical potential difference to their local plasma environment is minimal.

Comets are asteroids with eccentric orbits move them from deep space to closer to the suns stronger electromagnetic forces and this means a larger electric potential difference, resulting naturally in electrochemical and other electricity phenomena.

The 288P binary active asteroids are therefore observed as comets as they are in electrical stress.

The various features of 288P—wide separation of the two components, near-equal component size, high eccentricity and comet-like activity—also make it unique among the few known wide asteroid binaries in the Solar System.
Hubble discovers a unique type of object in the Solar System |

This also explains why asteroids can surprisingly display comet like properties and stop or start being cometary in nature.