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No. Mercury has nothing to do with comets. Comets are objects that orbit the sun independent of the planets.
When comets come close to the sun, they heat up and release gas and dust, creating a bright tail that is visible from Earth. This process is known as outgassing. The brightness of the comet depends on its size, composition, and proximity to the sun.
All comets have tails when their proximity to the sun is such that the icy debris in the comet is warmed enough to melt and fall away from the comet.
Comets become visible when they are closer to the sun and begin to heat up, causing them to develop a visible coma and tail. This closer proximity to the sun typically occurs in the inner solar system, where they become brighter and more conspicuous.
comets orbit the sun
Comets can be harder to see when they approach the Sun due to the increased brightness from sunlight scattering off dust and gas in the comet's coma and tail, as well as the proximity to the Sun's glare. However, some comets can become more visible as they get closer to the Sun and develop longer tails that reflect more sunlight.
it is zero that is the proximity of the sun to earth
No. Comets orbit the sun.
no only comets.
that comets circle the sun
No. Comets are not moons as they orbit the sun, not planets.
actually several comets circle the sun a year!