In 1987, near the end of the cold war, the united states and the soviet union signed a major treaty in which they agreed to a). implement a missile defense system b). reduce their nuclear arsenals c). begin a military exchange program d). end their missile inspection programs

What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? they created the scientific method to outline how science should be conducted. they were able to find the orbit of a comet and predict the year of its return. they discovered the three newest planets--uranus, neptune, and pluto. they explained why objects appear to have color.