Our Solar System
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Zoom Astronomy Our Solar System |
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| All About the Solar System | Origins | The Ecliptic | Where is our Solar System? | Exploring the Solar System | Kuiper Belt | Extremes | Learning Activities |
Our solar system formed about 5 billion years ago, from an enormous cloud of dust and gas, a nebula.The Sun, like other stars, was formed in a nebula, an interstellar cloud of dust and gas (mostly hydrogen). These stellar nurseries are abundant in the arms of spiral galaxies (like our galaxy, the Milky Way).
When a temperature of about 27,000,000°F is reached, nuclear fusion begins at the core of the Sun. This is the nuclear reaction in which hydrogen atoms are converted to helium atoms plus energy. This energy (radiation) production prevents further contraction of the Sun.
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