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The nucleus of a helium atom actually weighs only 99.3% as much as the two protons and two neutrons that go to make it up, the remaining 0.7% being released as heat and light energy. If the critical temperature is not reached, however, it ends up as a brown dwarf, or dead star, and never attains star status.Ī 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). If a critical temperature in the core of a protostar is reached, then nuclear fusion begins and a star is born. As gravity continues to pull ever more matter inward towards the core, its temperature, pressure and density increases. A protostar is formed when gravity causes the dust and gas of a nebula to clump together in a process called accretion. - Black Hole Theory & Hawking RadiationĪ star begins its life as a cloud of dust and gas (mainly hydrogen) known as a nebula.- Black Holes and Wormholes Introduction.Main Topics > Black Holes and Wormholes > Stars, Supernovas and Neutron Stars Topic Index:
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A Few Random Facts Where in the universe is the Earth? How fast are we traveling through space? How fast does light travel? How far is it to space, the Moon, the Sun, the stars, etc? How many stars are there? How does the Sun shine? What different types of stars are there? What is the human body (and the Earth, the Sun, the Universe) made of? How many molecules/atoms are there in each cubic meter? What if the history of the universe were squeezed into the period of one year? What are the coldest and the hottest objects in the universe? What is the electromagnetic spectrum? What is a planet? What is a dwarf planet? Why do the planets orbit the Sun?