![haleys comet haleys comet](https://images.fineartamerica.com/images-medium-large-5/optical-photograph-of-halleys-comet-ronald-royerscience-photo-library.jpg)
It is made of solids of extremely low densities of about 0.5 grams per cubic centimetre on average, due to its porous structure. The nucleus of the comet is very small its dimensions are roughly 15x8x8 km. To visualise this distance, imagine that of Pluto’s orbit. is equal to 149.60×106 km) and flies away in space to the point of aphelion at the distance of 35 a.u. Having our Sun in the focus of its path, the comet approaches the perihelion distance of 0.59 a.u. The orbit of the Halley’s Comet is elliptical with a high eccentricity, which is equal to 0.97, compared to 0.0167 for the Earth, or in other words, the major axis of the ellipse is about four times greater than the minor axis. The comet was called after Edmond Halley, who had calculated its orbit and predicted the next appearance very precisely. Many astronomers at different times from all over the world observed this phenomenon without realising that they actually see the same object periodically approaching the Earth. The first observation of the Comet Halley, which has been recorded, dates back to 240 BC. It orbits the Sun every 76 years, coming near the Earth within a human lifetime.
![haleys comet haleys comet](http://www.ancientpages.com/wp-content/uploads/2018/03/comethalley1910.jpg)
![haleys comet haleys comet](https://images.fineartamerica.com/images-medium-large-5/milky-way--halleys-comet-ronald-royerscience-photo-library.jpg)
Halley’s Comet is the most famous object, which can be easily seen with a naked eye. It is also a motivation for scientists that a new comet found in the Universe receives the name of its discoverer.
HALEYS COMET PROFESSIONAL
Their dynamics, behaviour and attraction encourage professional and amateur astronomers to hunt for these celestial objects. The word “comet” has its origin in Greek and means “long-haired”. Comets are one of the most exciting objects for astronomical observations.