Characteristics. Extrasolar planets

Characteristics. Extrasolar planets

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All the stars arise from a fragmentation, and its subsequent collapse, of the dust and gaseous clouds found in the so-called star-forming regions. During this process, surplus material is spinning around the star. The most accepted theory states that planets arise from the accumulation of that material that orbits around a star. According to this theory, the logical thing is that all the stars had planets, but it is a reality that has not been verified.

Since all stars are not equal, some are likely to be more likely than others to create planets. At present, scientists basically focus on studying those stars that are similar in size to our Sun. This is because their number is greater, and because they are likely to have similar conditions for the formation of a planetary system .

The stars are mainly composed of light elements such as hydrogen or helium. They also include a small amount of heavier elements, such as iron, that indicate the metallicity of the star. The more metallicity a star possesses, the more likely it is to form planets. In addition, it is shown that stars that have planets are usually deficient in lithium.

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Doppler spectroscopyKepler-62 star
Album: Photos of the Universe Gallery: Extrasolar planets