1. What is dark energy?

Answer: Dark energy is a mysterious force that is driving the accelerated expansion of the universe and is thought to make up about 68% of the universe.

2. What is a black hole?

Answer: A black hole is a region in space where gravity is so strong that not even light can escape from it, typically formed from collapsing stars.

3. What is the Big Bang?

Answer: The Big Bang is the theory that the universe began from an extremely hot, dense state around 13.8 billion years ago and has been expanding ever since.

4. What is a galaxy?

Answer: A galaxy is a large system of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

5. How many galaxies are in the universe?

Answer: There are estimated to be about 2 trillion galaxies in the observable universe.