1. How did the universe begin? What happened during the Big Bang?
2. What came before the Big Bang? Where was the Big Bang located?
3. Is there a center of the universe? Is space flat or curved?
4. How do we measure a galaxy's distance? What is dark matter? What is dark energy?
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Answer:
there is no end or start of universe. Before 7 billion years a cosmic explosion happened called big ban and it is still continuing today. Due to this expansion first came the forces of physics and subsequently formation of elementary particles, atoms , molecules, stars and galaxies.
We measure galaxy distance in astronomical unit.
Dark matter is visible matter that does not have enough gravitational pull to hold galaxies together.
Dark energy