because 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.
Their bright colors make it look as if they glow in the light.
Magnesium is an element that emits a bright white glow when ignited.
No. Mercury has nothing to do with comets. Comets are objects that orbit the sun independent of the planets.
Sodium gas emits a bright yellow-orange glow when excited.
Yes they do. They come in different colours aswell. Mainly Red Green and Yellow.
Yes it will. All you have to do is keep it in the freezer for about an hour, then crack it again and it'll begin to glow. It will not glow as bright as it did the first time though.
That will depend on when you make the trip. There are MANY comets detected each year, although only a few become bright enough to be seen with the naked eye, and very few are bright enough to be seen with the naked eye from bright city lights. We typically detect comets when they are about a year out from the Sun, although a flurry of smaller "Sun-diving" comets were detected only hours before they fell into the Sun in December, 2010.
glow in the dark
To reuse a glow stick, you can put it in the freezer to slow down the chemical reaction and make it last longer. However, the glow will not be as bright as the first use.
To recharge a glow stick, expose it to a bright light source for a few hours. The light will energize the chemicals inside the stick, allowing it to glow again.
To recharge glow sticks, expose them to a bright light source for a few hours. This will help the chemicals inside the glow sticks to become activated again, allowing them to glow brightly once more.
It depends on where the comet is in relation to the earth and sun, but not many comets would be bright enough to be seen before dusk or after early dawn.