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Definition
One region that is slightly denser than the rest of the nebula
will pull more of the gaseous hydrogen to itself, and it will begin to grow. |
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In the core, where temperatures and pressures are high enough, hydrogen
nuclei fuse to form helium nuclei, with a small loss of mass, in a process
called nuclear fusion. |
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Definition
| The next layer, the radiative zone, is about 3.5 105 km thick. |
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Definition
The outermost layers of the Sun are the 2 x10^5 km thick convective
zone at 2 x 10^6 °C |
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| 300 km thick photosphere at 5500 °C |
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Definition
| a layer of somewhat thinner gases at 60 000 °C that make up the inner atmosphere of the Sun. |
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Definition
| the Sun’s outer atmosphere of thinner gases at a temperature of 2 x 10 ^6 °C. |
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Definition
| Dark spots, called sunspots, Sunspots vary in size and regularity, and they are caused by disturbances in the Sun’s magnetic field. |
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Definition
The Sun regularly releases about 1.0 x 10^11 tonnes of glowing hydrogen
from the photosphere as solar prominences |
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Term
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Definition
| Solar flares are produced by the rapidly changing magnetic fields around sunspots, and they only last a short time. Solar flaresalso emit high-energy X-rays and ultraviolet radiation. |
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Term
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Definition
| emitted from the Sun all the time, is ionized gas. The solar wind is strongest when there are solar flares and prominences. |
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