Periodic comet visible every 76 years.

DNA damage measurement in cells.

(formally designated C/1973 E1 and formerly as 1973 XII and 1973f) a comet that passed close to the Sun towards the end of 1973.

Trail following a bright comet.

Comet with predictable orbital return times.

Comet Encke , or Encke's Comet (official designation: 2P/Encke), is a periodic comet that completes an orbit of the Sun once every 3.3 years.

Airplane simulating zero-gravity conditions.

Telescope designed for spotting comets.

A great comet which can be seen from Earth every 75–76 years.

Periodic comet visible every 76 years.

Tool for locating celestial icy bodies.

Resembling a small, icy celestial.

A periodic Jupiter-family comet first recorded in 1772, subsequently splitting in two and not observed since 1852.

Crankset model by FSA brand.