Comets

Meteors, asteroids, and comets are all objects in space. Meteors are shooting stars that enter Earth's atmosphere, asteroids are rocky objects that orbit the Sun mostly in the asteroid belt between Mars and Jupiter, and comets are icy objects that orbit the Sun in more elongated paths. While they all originate from space, their composition and behavior can vary significantly.

Comet. Comets typically have faster orbital speeds than asteroids as they move along highly elliptical orbits that bring them close to the sun, increasing their speed. This is due to the gravitational pull of the sun that speeds up comets as they approach perihelion, their closest point to the sun.

Hopefully some serious advances in medicine come about, as we will need them to view this comet again. It is estimated that this comet will not return for another 29,500 years.

Comet Hale-Bopp has a highly elliptical orbit of about 4,200 years so it does not come close to Earth frequently. Its last close approach to Earth was in 1997 when it was visible in the sky for an extended period. It is not expected to come close to Earth again for several millennia.

Yes, comets have cores, also known as nuclei, which are typically made up of ice, rock, and organic compounds. The icy nucleus is the solid center of a comet that remains intact as it travels through space, with a coma and tail forming as the comet approaches the Sun.

You can determine the direction in which a comet is moving by observing its motion against the background stars over a period of time. If the comet appears to be moving eastward against the stars, it is moving in a westerly direction in relation to the Earth. If it appears to be moving westward, it is moving in an easterly direction from Earth's perspective.

The three main parts of a comet are the nucleus (solid core made of ice and dust), coma (gaseous envelope surrounding the nucleus), and tails (two types, ion tail composed of ionized gas and dust tail made of dust particles).

Earth is a large, solid planet with a well-defined orbit around the sun, while a comet is a much smaller, icy body that orbits the sun in an elongated, elliptical path. Comets can develop spectacular tails as they approach the sun due to the heat causing the icy material to vaporize, whereas Earth does not exhibit such phenomena.

Comet Halley is a famous periodic comet that orbits the Sun about every 76 years. It was last seen in 1986 and will next be visible from Earth in 2061. Its discovery and observation contribute to our understanding of comets and their trajectories.

First, the danger must be detected way ahead of time. Second, something would have to be done to change their orbits. For example, making atom bombs explode on or near their surface has been considered. If detected way in advance, a small change in its direction could take it away from Earth. This is all hypothetical - so far, no Near Earth Object has been thus stopped.

Comets reflect light from the sun. This is the same way you see the moon glowing. When a comet's orbit nears the Sun it starts to warm up since they are usually black in colour. Water vapour sublimes from the surface of this 'dirty snowball' and forms a cloud of ice crystals known as the 'Coma'. It is this white cloud that reflects sunlight and makes it visible to us.

While this question theoretically has an answer, we don't know what it is, and no one is particularly interested in finding out. There are lots of very long period comets with multi-thousand or even million year orbits.

Anywhere from "millions of years or more" to "just until the next time they approach the Sun" (or hit something, like Comet Shoemaker Levy 9 did Jupiter in 1994). Some comets making their first approach to the Sun (presumably after a gravitational encounter in the outer solar system) come too close and are destroyed. Most familiar comets like Halley's Comet can be expected to "live" millions of years into the future as they have relatively stable orbits and do not come too close to the Sun.

Comet speeds increase as they near the sun due to the sun's gravitational pull. The sun's gravity accelerates the comet as it moves closer, causing an increase in speed. Additionally, as the comet nears the sun, it is subjected to increasing solar radiation and solar wind pressure, which can also contribute to its acceleration.

Europa's atmosphere is very thin and composed primarily of oxygen, with trace amounts of other gases like carbon dioxide and molecular hydrogen. The moon's thin atmosphere is created by radiation splitting water molecules on the surface into these constituent gases.

Comets are made up of dust, rock, ice, and frozen gases. The most common compounds found in comets include water ice (H2O), carbon dioxide (CO2), ammonia (NH3), methane (CH4), and carbon monoxide (CO). Additionally, comets can contain organic molecules such as formaldehyde and methanol.

Most comets, like the rest of the solar system, are about 4.5 billion years old.

1. Nucleus: The solid core of a comet composed of ice, rock, and dust.
2. Coma: The gas and dust envelope that surrounds the nucleus when the comet approaches the sun.
3. Tail: The long stream of gas and dust particles that is pushed away from the coma by solar radiation pressure, always pointing away from the sun.

Edmond Halley saw a fuzzy star with a tail in 1682 and correctly predicted that it would reappear in 1758. This periodic comet was later named Halley's Comet in his honor.

The word for every 75 years is "septuagesimal."

As objects visible to astronomers with telescopes, it is a rare time when some comet is not visible in the sky, at some place in the world. But as far as large, naked-eye comets, the last one was Comet Hale-Bopp, which reached maximum brightness in April of 1997. It will not return for about 2500 years. New comets are being discovered all the time, but there is no way to predict when or if a large, naked-eye comet will be seen again. We are reasonably sure of the return of Comet Halley, but that will next be in 2061.

the answer is idk

Yes, it does have brighter and longer tail, because during its closest approach to the sun, it was most effected by the sun (evaporating the more water from the comet).

When it was further out, when the sun is much further, it will gradually become cooler, no ice evaporating too space, and no tail.

Asteroids, meteoroids, and comets orbit the Sun due to the gravitational pull between these celestial bodies and the Sun. Their orbits are influenced by their initial velocity, mass, and distance from the Sun. When they come close to Earth, they can be observed as shooting stars or meteor showers.

He didn't discover it.

He did some calculations that suggested that a certain comet, seen during his lifetime, and three comets seen many years before, had the same orbit, and therefore were all probably the same comet.

He also predicted that this comet would return in a certain year in the future.

It did and it was named as Halley's comet, in his honour.