Question

What is causing the universe to expand each second?

Answer 1

Answer:

This means that for every megaparsec -- 3.3 million light years, or 3 billion trillion kilometers -- from Earth, the universe is expanding an extra 73.3 ±2.5 kilometers per second

Answer 2

Answer:

Let's talk about Dark Matter for a moment. If dark energy makes up 68 percent of the Universe, the remaining 32 percent must be made up of ordinary stuff.

Explanation:

• However, observations suggest that the universe contains very little observable stuff.
• Although the best estimates of matter in the cosmos are barely 5%, there appears to be something else related to'matter' that exists but has yet to be discovered.
• Dark Matter was coined to describe this phenomenon, although it is still a mystery.
• Now it looks that the Universe will not only continue to expand indefinitely, but that the rate of expansion will continue to accelerate. Different theories have been proposed by perplexed experts as to why the expansion is speeding faster.
• At the end of the day, theorists still don't have a definitive solution, but it is widely acknowledged that some previously unknown energy is to blame, dubbed "Dark Energy." Dark energy could be a property of space, according to one theory.