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Topics: Star, White dwarf, Galaxy
How did the universe originate and evolve to produce the galaxies, stars, and planets we see today?

How did we get here? In order to understand how the Universe has changed from its initial simple state following the Big Bang (only cooling elementary particles like protons and electrons) into the magnificent Universe we see as we look at the night sky, we must understand how stars, galaxies and planets are formed.
There are many questions associated with the creation and evolution of the major constituents of the cosmos. A basic question astronomers must address is, how did the Universe create its first stars and galaxies? Once these entities were created, how did they influence subsequent galaxy, star and planet formation? This is an important question, because these later objects are made of elements that can only have been created by the first generation of stars.
It is still unknown whether the Universe created black holes with the first generation of stars or whether these exotic objects were created by the first generation of stars. Because black holes represent the most extreme physical conditions of spacetime and generate some of the most energetic phenomena following the Big Bang, they are the ultimate physical laboratories for testing theories of the Universe.
We now know that our Universe has a "foamy" structure. The galaxies and clusters of galaxies that make up the visible Universe are concentrated in a complex scaffold that surrounds a network of enormous cosmic voids. However, in addition to the "normal" matter that makes up the visible parts of the Universe, scientists have discovered that there are vast amounts of unseen matter. This so-called, "dark matter" makes up roughly 27% of the matter-energy content of the Universe, while the visible pieces account for only about 5% of the total. Clearly, if we hope to understand the structure of the Universe and the processes by which it formed and evolves, we must first understand the distribution

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