if bugs are attracted to sun light, how come they don't fly endlessly and helplessly towards the sun?

Bugs need light to see. Thats why at night they crowd endlessly around around street lamps and other sources of artificial light. But during the day, everything is illuminated by the sun and they can see they're way around even though the sun is the brightest thing during the day. When they can see the environment around them , they can worry about other things such as feeding, breeding, and watching out for predators.

There are one or two entomologists that frequent this site, I think they could give a fuller account of this, but anyway...

Diurnal insects use the position of the sun as a navigational aid. Given the great distance away that the sun is, it is ostensibly a fixed point upon which an insect can orientate its flight path and use that orientation to navigate around its environment in conjunction with other methods such as landmark recognition. This skill, like all others is developed over many generations along the path of evolution. An insect that happened upon this method of navigation had an advantage over one that did not. Another that was transfixed by the sun and flew directly at it in a transfixed manner would of course die (think logically for the reasons, don't jump to silly conclusions !). So only those insects that exploited and utilised this newly discovered navigational aid correctly tended to pass on those genes fostered the behaviour in subsequent generations. Clearly those that did not utilise it, or were transfixed were less, or unsuccessful at propagating their genes. And so there would be a natural tendency toward an ever increasing frequency of the advantageous genes (an underlying principle of evolution itself). In this way, natural selection would only tend to allow the proper navigators survive - the ones that did not do what you ask.

Something you may have thought of from this is moths flying around street lights and such. Nocturnal insects use the moon in the same way. Before the advent of modern man, there were of course generally no other bright light sources to cause confusion. These additional sources cause confusion and a 'misfiring' of the intrinsic navigational system.

They confuse it with the moon Many evening insects use the moon as a navigational device because that is the brightest organic gentle at evening. And the following comes guy with the white electric powered gentle that and confuses those insects. The insects fallacious the solid shiny electric powered gentle (that would want to be emanated from a street gentle as an celebration) to be the moon and as they attempt to keep a particular attitude from the moon at the same time as they fly, on occasion they keep fly in circles round it.

They are not attracted to sunlight. They are attracted to the smell of rotting flesh. It is true that flies orient themselves towards light when trapped, for example, within a house. But that is only because they have evolved to follow in the direction of light whenever they are trapped. If they fly into a cave by mistake for example, they can get out by following the ligth towards the entrance. If they fell down a hole in the ground or in a tree, they can find an exit by following the light. Many insects have evolved the same instincts. It is one reason many dead bugs are found on the lamp shade of your ceiling light fixture if you bother to go look.

what he/she means is why dont they before hitting the earths atmoshpere shield dont they fly toward the sun. perhapes its due to the ideah they relize its to far and the food source is lower but im sure if there food source was in the sky im sure they would try

1.The sun will burn them if they keep flying.

2.They need to eat.

3.They need to mate.

Because the earth's gravity doesn't allow them to.