How big is Halley's comet? Is it bigger than the earth?
May be interested in ""observation record: the historical appearance time of Halley's comet.
The original mass of Halley's comet is estimated to be less than 65.438+0 trillion tons. If we take an approximate value, the average density of the nucleus is 654.38+0 grams per cubic centimeter, and the radius of the nucleus should be less than 654.38+0.5 kilometers. It is estimated that its mass will be reduced by about 2 billion tons per revolution, which is only a small part of its total mass, so it will exist for a long time.
The orbit of Halley's comet is reversed, and it is inclined at 18 degrees with the ecliptic plane. In addition, like other comets, the eccentricity is very large.
The nucleus of Halley's comet is about 16x8x7.5. Contrary to previous expectations, the nucleus of Halley's comet is very dark: its reflection.
The ratio is only 0.03, which makes it darker than coal and one of the darkest objects in the solar system.
The nucleus of Halley's comet is an ugly and dirty guy. It looks more like baked potatoes than peanuts with shells. The epidermis is covered with cracks, wrinkles and scars, and its dirty and black degree is unimaginable. Its longest length is 16 km, its widest point and thickest point are about 8.2 km and 7.5 km respectively, its mass is about 300 billion tons, and its volume is about 500 cubic kilometers. The density of Halley's comet nucleus is very low: about 1 g/cm3, which indicates that it is porous, probably because most of the dust is left after ice sublimation. The surface of Halley's comet is darker than coal ash, which makes it absorb a lot of solar radiation and make the temperature reach 30 ~ 100℃. At least 5 ~ 7 places on the surface of the comet nucleus are constantly throwing dust and gas out.
The comet's tail nucleus gradually approached the sun, and its surface began to be heated and vaporized, and the hibernating comet entered an active period of life. Reflect the sunlight and yourself.
Excited light made it put on a gorgeous coat. The clear and dense condensate in the middle is a coma, and the hazy and fluffy gas blanket is a coma with a faint and thin hydrogen cloud at the edge, which together constitute the head of the coma. The fiery red sun shines on every inch of space in the jurisdiction, and at the same time throws out a steady stream of subatomic streams, forming a solar wind blowing in all directions.
The fragile dust and volatiles on the comet dragged out a bright tail under the pressure of solar wind and light. No wonder the closer to the sun, the longer the tail. Wherever you go, your tail always points to the side facing away from the sun. When it bid farewell to its master and started on the road again, its tail has turned into a car light, illuminating the distance.
19 10, when Comet Halley returned for the last time, doomsday gatherings were held in many places, and people waited for the encounter between the earth and Comet Halley with irresistible terror. It was not until May 19 that the earth passed through the comet's tail unscathed that this sorrow came to an end. It turns out that the tail of a comet is a thin gas, which is more empty than the vacuum created in the laboratory. Scientists compare comets to "empty pockets" and "visible nothingness".
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