When it is from very far away, nothing. But when a comet approaches the inner Solar System,solar radiation causes the volatile materials within the comet to vaporize and stream out of the nucleus, carrying dust away with them. That is what we call the 'tail' of a comet.
Comets are not a source of light themselves, but they reflect sunlight. When sunlight hits a comet's nucleus, it causes the surrounding gas and dust to glow, creating the characteristic tails we see from Earth.
A comet produces a shimmering tail that lasts a few days when it approaches the sun. This tail forms as sunlight vaporizes the comet's icy nucleus, releasing dust and gas that reflect sunlight to create a glowing effect.
The Comet's Tail forms when sunlight causes the Comet's ice to change to a gas. The gas or ion , tail of a comet streams from the comet's head, carrying with it dust particles. The solar wind electrically charged particles, expand away from the sun pushes the gas away from the comet's head. Regardless of where its going the tail points away from the sun.
The sunlight hits the glass of water and then the light disperses out as a spectrum of colour (rainbow). This is because sunlight is white light and white light contains the 7 colours of the rainbow. When it hits the glass the colours refract and disperse out as the spectrum of colours, which we see as a rainbow.
Comets are visible because they reflect sunlight. As a comet travels closer to the Sun, the sunlight heats up the comet's surface, causing it to release gas and dust that form a glowing coma and tail. This reflected sunlight is what makes comets visible from Earth.
You usually get a crater, with surrounding damage.
Sunlight that hits the Earth's surface is absorbed by the Earth. It is then reflected back.
Comets are not a source of light themselves, but they reflect sunlight. When sunlight hits a comet's nucleus, it causes the surrounding gas and dust to glow, creating the characteristic tails we see from Earth.
sunlight
Light from a comet is just reflected sunlight.
Comet tails are made of ice and dust.
nien
The sunlight will be absorbed by the surface.If the surface is a mirror,lesser light will be absorbed.More will be reflected. If the surface is black,more light will be absorbed.
The comet appears green because of the gases it releases when it gets close to the sun. The gas molecules in the comet's tail interact with sunlight, causing them to emit a greenish glow.
It depends on the size of the comet. For example if a 9-mile comet's diameter hits earth it would create a huge destruction when the earth's dust totally blocks the sunlight and all the plants would die off, and leads to another Ice Age.
Comet Tempel-Tuttle.
The green color of a comet is caused by the gases it releases, such as diatomic carbon and cyanogen, which emit green light when they interact with sunlight.