LaGrange points: a second look

Earlier, I had mentioned that LaGrange points might be useful for interplanetary or interstellar travel. These points are useful, because very little energy is required to change trajectory within them, and that they can be orbited, in spite of having no actual mass. The problem is, this will lead to a collection of 'junk' at these points - at a real collision hazard for spacecraft travelling at high velocity relative to the LaGrange point. An example of such matter is the Trojan Asteroids at the LaGrange points of Sol-Jupiter, and speculation that another group of LaGrangian Asteroids at the Neptune-Sol LaGrange points, containing large asteroids numbering an order of magnitude large than the groups around Jupiter.

Yet the LaGrange points with large bodies in them may not be as dangerous as others. Depending on the 'settlement' of the star and planetary systems, meaning, roughly, the age since a major change, minor debris may have been pulled to the surface of the more massive bodies. Since the massive bodies are more easily detected at a distance, this may mean that collission can be more easily avoided.

A useful, if ambitious, feat of celestial engineering would be to 'cleanse' LaGrange points by the use of the gravitation pull of a large spacecraft, porposeful collision with a spacecraft which is designed to withstand the collission (a slow, massive, "celestial snowplow"), or perhaps by an energetic blast of low mass (accelerated gas, perhaps - a "celestial leaf-blower"). The question remains, of where to push / pull these objects - towards a massive body in the LaGrange point, or out of the LaGrane point entirely, to be captured by the gravity of a planet or star.

I use the term 'celestial' here with some trepedation. I can't use "Solar" or "Star System" engineering, as these would seem to either apply only to the local star system, Sol, and the latter term "Star System", would seem, at first reckoning, to indicate much larger changes. Yet perhaps that is appropriate, as the system of the star and its satellites is the reason for the LaGrange points and their objects.

To conclude, the use of LaGrange points, particularly by a spacecraft at high velocity, is not to be lightly considered.