#universe

The United States National Academy of Sciences describes what a theory is as follows:

The theory of biological evolution is more than "just a theory." It is as factual an explanation of the universe as the atomic theory of matter (stating that everything is made of atoms) or the germ theory of disease (which states that many diseases are caused by germs). Our understanding of gravity is still a work in progress. But the phenomenon of gravity, like evolution, is an accepted fact.

But we don't know how life first appeared. We have two pieces of observational evidence on the probability of life appearing. The first is that we have fossils of algae from 3.5 billion years ago. The Earth was formed 4.6 billion years ago and was probably too hot for about the first half billion years.
- Stephan Hawking / Questioning the universe (TEDx Talks)

Up until the 1920s, everyone thought the universe was essentially static and unchanging in time. Then it was discovered that the universe was expanding. Distant galaxies were moving away from us. This meant they must have been closer together in the past. If we extrapolate back, we find we must have all been on top of each other about 15 billion years ago. This was the Big Bang, the beginning of the universe.
- Stephan Hawking / Questioning the universe (TEDx Talks)

Give a kid a book and you change the world. In a way, even the universe.
- Cosmos: A Spacetime Odyssey Episode 4

The galaxy that my team discovered is even rarer and much more complex than that. You know, sometimes, you search and search for these objects, and you find nothing. But sometimes, it just appears in the background, when you are not even looking for it. But my research showed this is an entirely new galaxy type, now commonly referred to as "Burçin's Galaxy."
- Burçin Mutlu-Pakdil / A rare galaxy that's challenging our understanding of the universe (TEDx Talks)

https://youtu.be/0GPIemIX578

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