A. What is the primary mission of the Orbital Debris Observatory?
It is used as part of our national security to listen in on communication.
b. It is used to make three-dimensional models of the galaxies.
It locates spy satellites and decodes secret military languages.
d. It locates old satellites, lost equipment, and space-related garbage.
C.

The telescope is part of the ARES Division's Orbital Debris Program Office, whose mission is to determine the total amount of orbital debris and predict the risk it poses to spacecraft, including the International Space Station

Explanation:

The answer would be (D.) It locates old satellites, lost equipment, and space-related garbage.

Explanation: The prime objective is to monitor and assess the orbital debris environment by surveying orbiting objects at all orbital altitudes: LEO, medium Earth orbit, GTO, and GEO. The goal of the ODMSP was to limit the generation of new, long-lived debris by the control of debris released during normal operations, minimizing debris generated by accidental explosions, the selection of safe flight profile and operational configuration to minimize accidental collisions. There are millions of pieces of space junk flying in LEO. Most orbital debris comprises human-generated objects, such as pieces of space craft, tiny flecks of paint from a spacecraft, parts of rockets, satellites that are no longer working, or explosions of objects in orbit flying around in space at high speeds.

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-Astolfo

after the roman empire, the catholic church began to unify by taking on many duties of a government.

answer:   migrations were important in the neolithic period. "two major migrations passing through southeastern europe were confirmed by the means of archaeo-genetic studies."

the first migration was the early neolithic period -- 6,000 before common era (bce) -- when the first farmers, from anatolia -- asia minor -- spread through europe. the second migration occurred during the early bronze age (3,000-2,500 bce) when the so-called "steppe population," from the eurasian steppe, replaced much of northern europe's previous population.

the first farmers of northern and western europe passed through southeastern europe with limited hunter-gatherer genetic admixture, which occurs when two or more previously isolated populations begin interbreeding. however, some groups that remained mixed extensively -- without the male-biased, hunter-gatherer admixture that prevailed later in the north and west, according to latest discoveries. southeastern europe continued to be a nexus between east and west, with intermittent genetic contact with the steppe people up to 2,000 years before the migrations that replaced much of northern europe's population.

"in some places, hunter-gatherers and incoming farmers seem to have mixed very quickly," says iain mathieson, a geneticist at the university of pennsylvania, who was first author of the paper. "but, mostly, the two groups remained isolated, at least for the first few hundred years. these hunter-gatherers had been living there for thousands of years, and it must have been quite a shock to have these new people show up -- with a completely different lifestyle and appearance."