How big is Halley s Comet. How big is Halley s Comet? Is it bigger than Earth?

When the Sun was formed 6 billion years ago, Halley's Comet was so round in its orbit.

It does not fall into the center of the galaxy, relying on molecular electromagnetic forces as the main factor.

It is formed by trapping interstellar molecules such as water and methane in a high-speed ion stream.

Halley's comet is estimated to have a raw mass of less than 10 trillion tons, and if the average density of the comet's nucleus is 1 gram per cubic centimeter, the radius of the comet's nucleus should be less than 15 kilometers. It is estimated that it loses mass by about 2 billion tons per revolution, which is only a small fraction of its total mass, so it will exist for a long time. The orbital orbit of Halley's Comet is reversed, with an 18-degree tilt to the ecliptic plane.

Also, like other comets, the eccentricity is larger. The nucleus of the comet Halley's comet is about a kilometer in size. Contrary to previous predictions, Halley's comet's nucleus is very secretive

Its reflectivity is only, making it fainter than coal, making it one of the darkest objects in the solar system. Halley's comet's nucleus is an ugly, dirty one. It looks more like a roasted potato than a shelled peanut.

The epidermis is full of cracks, wrinkles and scars, and its dirt and blackness are unimaginable. It is 16 kilometers at its longest point, about kilometers at its widest point and kilometers at its thickest point, with a mass of about 300 billion tons and a volume of about 500 cubic kilometers. The density of the nucleus of Halley's Comet is very low:

About 1 gram cubic centimeter indicates that it is porous, probably because most of the dust has been left behind after the ice has sublimated. Halley's Comet has a surface darker than soot, which allows it to absorb a lot of the sun's radiation and make it warm to 30 100. There are at least 5 7 places on the surface of the comet nucleus that are constantly throwing dust and gases outward.

As the comet-tailed nucleus gets closer to the Sun, the surface begins to heat and vaporize, and the hibernating comet enters the active phase of life. The reflection of the sunlight and the envy of its own envy and the inspiring light give it a glorious appearance. The bright and dense condensation in the middle is the coma nucleus, the hazy and fluffy gas envelope is the coma, and there is a faint and thin hydrogen cloud at the edge, which together form the furious crest of the coma.

The flame of the sun shone on every inch of space in the jurisdiction, and at the same time ejected a steady stream of subatoms, forming a solar wind that blows in all directions. The dust and volatile matter on the comet, which is weak and windy, dragged out a large bright tail under the blowing of the solar wind and the pressure of light. It's no wonder that the closer you get to the sun, the longer the tail becomes, and no matter where you go, the tail always points to the side facing away from the sun.

When it said goodbye to its master and traveled again, its tail had become a light that illuminated the journey. In 1910, the year of Halley's last return, there were apocalyptic rallies in many places, and people waited with irrepressible terror for the Earth to meet Halley's Comet. It wasn't until May 19, when the Earth passed through the tail of the comet unharmed, that this unfounded worry ended.

It turns out that the tail of the comet is a thin gas that is emptier than the vacuum created in the laboratory, and scientists compare the comet to an empty pocket, which is nothing to see.

Halley's Comet (periodic comet catalog number: 1P Halley) is a periodic comet that orbits the Sun once a year and is visible to the naked eye. It is named after the English physicist Edmund Halley (1656-1742) who first measured his orbital data and successfully predicted the time of return.

Halley's Comet has an orbital period of 76 79 years, and its next perihelion will be on July 28, 2061. Halley's Comet was the first recorded periodic comet, and at the latest in 240 BC or 466 BC, there were clear records of the comet's appearance in China, ancient Babylon, and medieval Europe, but it was not known at the time that it was a recurrence of the same comet. According to Zhu Wenxin's research:

From the seventh year of Qin Shi Huang (240 BC) to the second year of Xuantong of the Qing Dynasty (1910), a total of 29 records were recorded, and the calculation results were in line with the results.

Halley's Comet is the only short-period comet that can be seen directly from Earth with the naked eye, and the only comet that can be seen twice in a lifetime with the naked eye. Other comets that can be seen with the naked eye may be more spectacular and beautiful, but those are comets that only appear once in thousands of years. Halley's Comet last returned in 1986, and the next return will be in mid-2061.

At the time of its return in 1986, Halley's Comet became the first comet to be observed in detail by a spacecraft, providing first-hand information on the structure of the comet's nucleus and the mechanisms of comet emitting and tail formation. These observations support long-held assumptions about comet structure, in particular Fred Hewlett-Packard's "dirty snowball" model, which correctly speculates that Halley's Comet is a mixture of volatile ice such as water, carbon dioxide, and ammonia and dust. The information provided by this mission also significantly reforms and reconfigures the idea of these materials; For example, understand that the surface of Halley's Comet is mostly dusty, has no volatile substances, and is only a small part of ice.

The Orionid meteor shower is caused by the famous Halley's Comet.