Halley’s Comet

Look if you were born after 80’s then you surely were so excited that you would be able to see Halley’s comet once in a lifetime because it is visible only once after every 76 years. Woah! That’s like just once in lifetime opportunity right? Because the human life span is on average 78 years for most humans,  yet perhaps if you get to see it twice then you are just lucky enough. Halley’s comet was last seen in 1986 and it will be visible next in 2060. That’s a long wait but why not? It is the ONLY comet that is visible to the human naked eye. It is also called as short period comet.
Halley’s comet is named after the Edmond Halley who discovered that it has a periodicity of 76 years. Halley’s comet was mentioned in several ancient places by Chinese, Babylon’s and Europeans in medieval age but they did not know that it is the same comet that appeared regularly after every 76 years.  It orbits the sun and has 20-200 years range as per solar system duration and any comet that has the same inclination and degree with the same range is called Halley-type comet. Halley has probably been in its current orbit for 16,000–200,000 years as of now. But as it approaches the sun and due to non-gravitational effects it emits sublimating gases and gets knocked off its orbit path a little which causes a delay of up to 4 days.
Halley’s comet is said to be a long period comet but due to perpetration and gravitational pull the orbit has changed. Further more Halley was properly studied for the first time during its last sighting. It is said to be made of volatile, ices, dust, water, carbon monoxide and ammonia.
So if you get to see this amazing thing in your lifetime then it’s a lifetime worth it.