Comet darner

The comet darner (Anax longipes) is a common species of dragonfly of the Aeshnidae family.

Description

The comet darner is a large dragonfly and has a green thorax and bright red abdomen. Females have a brownish abdomen patterned with blue spots.

Distribution and habitat

Comet darners are found in shallow lakes and ponds which tend to have extensive beds and grasses and lack fish. They are found along the eastern United States from Missouri, Michigan, New England and some even further north.

Endangered status

Its endangered status is of least concern.

References

Comet

A comet is an icy small Solar System body that, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind upon the nucleus of the comet. Comet nuclei range from a few hundred metres to tens of kilometres across and are composed of loose collections of ice, dust, and small rocky particles. The coma and tail are much larger and, if sufficiently bright, may be seen from the Earth without the aid of a telescope. Comets have been observed and recorded since ancient times by many cultures.

Comets usually have highly eccentric elliptical orbits, and they have a wide range of orbital periods, ranging from several years to potentially several millions of years. Short-period comets originate in the Kuiper belt or its associated scattered disc, which lie beyond the orbit of Neptune. Long-period comets are thought to originate in the Oort cloud, a spherical cloud of icy bodies extending from outside the Kuiper belt to halfway to the next nearest star. Long-period comets are directed towards the Sun from the Oort cloud by gravitational perturbations caused by passing stars and the galactic tide. Hyperbolic comets may pass once through the inner Solar System before being flung out to interstellar space.

Comet (disambiguation)

A comet is a small astronomical body which orbits the sun.

Comet may also refer to:

Arts and entertainment

In print

Music

Roller coasters

Comet (book)

Comet is a 1985 popular-science book by Carl Sagan and Ann Druyan. The authors describe the scientific nature of comets, as well as their varying roles and perceptions throughout history. The evolution of human understanding of comets is also detailed, and thinkers and astronomers such as Edmond Halley, Immanuel Kant, and William Huggins are discussed.

The publication of the book was months ahead of the 1986 appearance of Halley's Comet.

References