Paleontological and Paleobotanical Museum (Nostimo) teeth of a shark that was 20–25 m long, and a Late Pliocene (3.5 million years old) tooth of an "Anancus arvenensis", a mastodon, an ancient relative of the elephant, which has been recognised here for the first time in the wider area of Western Macedonia. The mastodon which lived in this area was about the same size as a modern elephant, but with longer tusks. Also displayed are some Neolithic tools (from the 4th millennium BC): a fishing weight, and a blade for harvesting crops. Paleontological and Paleobotanical Museum (Nostimo) The Paleontological and Paleobotanical Museum () at Nostimo is
Extinct comet the Hubble search for transition comets. Comets such as C/2001 OG108 (LONEOS) may represent the transition between extinct comets and typical Halley-type comets (periods of 20–200 years) or long period comets (periods longer than 200 years). Minor planets of the group of damocloids have been studied as possible extinct cometary candidates due to the similarity of their orbital parameters with those of Halley-type comets. Dormant comets are those within which volatiles may be sealed, but which have inactive surfaces. For example, 14827 Hypnos may be the nucleus of an extinct comet that is covered by a crust several centimeters thick