Main sequence - Wikipedia The main sequence is sometimes divided into upper and lower parts, based on the dominant process that a star uses to generate energy The Sun, along with main sequence stars below about 1 5 times the mass of the Sun (1 5 M ☉), primarily fuse hydrogen atoms together in a series of stages to form helium, a sequence called the proton–proton chain
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Stellar classification - Wikipedia Of the main-sequence star types, stars more massive than 1 5 times that of the Sun (spectral types O, B, and A) age too quickly for advanced life to develop (using Earth as a guideline) On the other extreme, dwarfs of less than half the mass of the Sun (spectral type M) are likely to tidally lock planets within their habitable zone, along with
ESSD - Global Carbon Budget 2022 - Copernicus. org Abstract Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate is critical to better understand the global carbon cycle, support the development of climate policies, and project future climate change Here we describe and synthesize data sets and methodologies to quantify the