I'm not entirely sure if this is precise, but Halley's Comet has about a mass of 2.2 x 10^14 kg, which is about 4.85 x 10^14 pounds.
It is supposed to be an "average" comet, but there is much speculation as to whether or not this is true. The mass of the object is still in question, and that helps promote the idea that it may not be a comet.
The gasses liberated in the comet's tail are very diffuse. So it takes many trips of a comet about the sun to bleed off a lot of mass, unless the comet passes sufficiently close to the sun (or collides with it or with something else). Eventually the comet would become a much smaller, rocky body, sort of like an asteroid. All the water vapor, methane, and ammonia will have bled off.
Nothing much, recently. Halley's Comet is out beyond the orbit of Neptune. moving slowly through space near the peak of its path through the solar system. Because it is so far from the Sun, it is frozen solid, with not gaseous coma reflecting the sunlight. And because comet nuclei are fairly small, it is invisible in all except the largest telescopes.
Halley's comet's mass (weight) is exactly 2.2×1014 (TO the power of 14)
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Comets have significantly less gravity compared to Earth due to their much smaller mass. For example, a typical comet can have a mass that is a fraction of that of Earth, resulting in a gravitational pull that is only a tiny fraction of Earth's gravity. This means that objects on a comet weigh much less than they would on Earth, allowing for lower escape velocities and unique surface conditions. Consequently, the gravitational environment on a comet is much weaker, affecting how objects move and behave on its surface.
This depends on the half-life of the atom
In 1994, comet Shoemaker-Levy collided with Jupiter. Much of the comet broke up in the atmosphere. The comet left visible scars on Jupiter for many months.
We believe comets have a composition like a dirty snowball. They contain alot of ice and dust. The ice does trun into a gas when the comet approaches near to the sun and this causes the comet's tail to form.
Depends on how big the Comet is.
It's just over 21%.
Neutron star