Answer:
The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching).
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Answer:
The Battle of Chickamauga, fought on September 18–20, 1863, between U.S. and Confederate forces in the American Civil War, marked the end of a Union offensive, the Chickamauga Campaign, in southeastern Tennessee and northwestern Georgia.
Answer:
Undersea explorer Jacques Cousteau co-invented the Aqua-Lung, a breathing device for scuba-diving, in 1943. In 1945, he started the French Navy's undersea research group.
Explanation:
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It helped him study the four moons that revolve around Jupiter.
It helped him make observations that supported the heliocentric theory.