In which order did te events forming our solar system occur?

Event 1. a cataclysmic event initiated the collapse of the solar nebula.step 2. the temperature of the solar nebula began to increase, as it rotated faster and flattened into a disc.step 3. hydrogen and helium remained gaseous, but other materials would condense into solid "seeds."step 4. temperature differences in the nebula caused terrestrial planets to form closer to the center of the nebula and gaseous planets to form farther out.step 5. solar wind from the sun blew the remaining gas into interstellar space.

Ibelieve the answer is c. 

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11