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00:00:51 1 History
00:01:12 2 Characteristics
00:03:00 3 Types
00:04:48 4 Planets
00:05:28 5 See also



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"I cannot teach anybody anything, I can only make them think."
- Socrates


SUMMARY
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T Tauri stars (TTS) are a class of variable stars associated with youth. They are less than about ten million years old. This class is named after the prototype, T Tauri, a young star in the Taurus star-forming region. They are found near molecular clouds and identified by their optical variability and strong chromospheric lines. T Tauri stars are pre-main-sequence stars in the process of contracting to the main sequence along the Hayashi track, a luminosity–temperature relationship obeyed by infant stars of less than 3 solar masses (M☉) in the pre-main-sequence phase of stellar evolution. It ends when a star of 0.5 M☉ develops a radiative zone, or when a larger star commences nuclear fusion on the main sequence.

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