Comets

Comets generally follow an elliptical path around the Sun, taking them from the outer edges of the solar system to close approaches to the Sun. As a comet gets closer to the Sun, the heat causes it to release gas and dust, forming a glowing coma and sometimes a tail that points away from the Sun due to solar wind. After their close approach, comets move back towards the outer solar system.

Asteroids, comets, and meteors fall suddenly towards Earth due to gravitational forces. When they come within range of Earth's gravity, they are pulled in, causing them to fall towards the planet at high speeds. Additionally, factors like orbital dynamics and collisions in space can also contribute to their sudden approach.

A comet's orbit is very elliptical -- it is a very elongated oval. The sun is at one focus of the ellipse, and typically the other focus is somewhere beyond the orbit of Pluto, in the Oort Cloud. Kepler's Laws tell us that a body orbiting the sun will move more quickly when it is closest to the sun, in this case when it is in the inner system. So a comet will move very slowly at the outer end of its orbit, speeding up as it falls towards the Sun, whip through the inner system at a great speed as it rounds the sun, and then slow down as it heads back out to the cold. Because the orbit is so very eccentric, it takes far longer to travel through the far end of it than through the inner system; a typical case would be a comet with a 70-year period that spends only a week in the inner system each orbit.

each crat er is about 1 km in diameter, Halley's comet's mass is 1017 G, ut has an average density of about 09.3 G/CM3

No, Halley's Comet does not have rings. It is a periodic comet that orbits the Sun every 75-76 years, and its nucleus is surrounded by a glowing coma and a tail formed by dust and gas particles as it gets closer to the Sun.

they come from space DUHXX

Halley's comet will next be visible from Earth in 2061, approximately every 76 years. Hale-Bopp, on the other hand, has an orbital period of about 2,532 years, so it won't be visible again from Earth until around the year 4385.

The tail of a comet is shaped by the solar wind, which pushes the gas and dust particles emitted from the comet's nucleus away from the Sun. The particles are ionized by sunlight and are then affected by the Sun's magnetic field, forming the distinctive shimmering tail.

The cost of the GOCE satellite mission was approximately 350 million euros.

Stars are not literal flames that can be "blown out." Stars create light through nuclear fusion in their core, so they do not need to be relit like a candle. Once a star exhausts its fuel and reaches the end of its life cycle, it may undergo changes such as becoming a white dwarf, neutron star, or even a black hole.

Comet Hyakutake, officially named C/1996 B2, made its closest approach to Earth in March 1996 and is not expected to return within our lifetime. Its orbital period is estimated to be over 70,000 years.

Shoemaker-Levy 9 will not return as it broke apart and collided with Jupiter in July 1994. It is not expected to reassemble or return as a single entity.

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.