The universe life and death of a star answers
Universe Quotes (2152 quotes)
The Life and Death of Stars: White Dwarfs, Supernovae, Neutron Stars, and Black Holes
The Life and Death of Stars
A star begins its life as a cloud of dust and gas mainly hydrogen known as a nebula. A protostar is formed when gravity causes the dust and gas of a nebula to clump together in a process called accretion. As gravity continues to pull ever more matter inward towards the core, its temperature, pressure and density increases. If a critical temperature in the core of a protostar is reached, then nuclear fusion begins and a star is born. If the critical temperature is not reached, however, it ends up as a brown dwarf, or dead star , and never attains star status. A typical star like our own Sun technically a yellow dwarf star , then, is fuelled by nuclear fusion , the conversion of hydrogen the simplest atom , with a nucleus consisting of just one proton into helium the second simplest, with two protons and two neutrons in its nucleus.
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statistical methods for health care research
In the beginning, there was darkness and then BANG! Giving birth to an endless expanding existence of time, space and matter., Stellar evolution is the process by which a star changes over the course of time. Depending on the mass of the star, its lifetime can range from a few million years for the most massive to trillions of years for the least massive, which is considerably longer than the age of the universe.
NARRATOR: Peering into the depths of space, astronomers glimpsed something astounding, the most powerful explosions since the creation of the universe. What would happen if such an event took place near Earth? What is the source of these explosions that go back to the dawn of time itself? Science: it's given us the framework to help make wireless communications clear. This program is funded in part by the Northwestern Mutual Foundation. Some people already know Northwestern Mutual can help plan for your children's education.
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