List 5 famous comets, and explain when the next one will be visible from Earth?

Halley's Comet. Halley's Comet is the most famous of all comets

Shoemaker Levy-9.

Hyakutake.

Hale Bopp.

Comet Borrelly

IF HELPFUl mark brainliest

1. Halley’s Comet

2. Shoemaker Levy-9

3. Hyakutake

4. Hale Bopp

5. Comet Borrelly

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.