1. In 1543, Nicolaus Copernicus (publish) ______published ______ “On the Revolutions of theHeavenly Spheres” claiming that the Earth and the planets (orbit) orbited the Sun.
2. Galileo (use) ______had used______ the telescope to view the stars and planets before IsaacNewton (invent) ______invented______ the first reflecting telescope.
3. In 1686, Isaac Newton (publish) _____published _______ the Mathematical Principles of Natural Philosophy where he (lay)______laid ______ the foundations for universalgravitation and (describe)______described______the motion of the Sun and the planets.
4. After Robert Goddard (work)______had worked______on rocket technology, he (invent)______invented ______and (launch)______launched______the first liquid-fueled rocket in 1926.
5. On November 3, 1957, the Russian dog Laika (become)_____became _______the first animal in orbit after fruit flies (be sent)______had been sent______to outer space by the United States.
6. In 1983, Sally Ride (become)_____became _______ the first American woman in space after Russian cosmonaut Valentina Tereshkova (be sent)______had been sent______ in space twenty years earlier.
7. France (launch)_____had launched______its first satellite before Japan (put)_____put_______its test satellite into orbit.