- A carbon star (C-type star) is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen. The two elements combine in the upper layers of the star, forming carbon monoxide, which consumes most of the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds, giving the star a “sooty” atmosphere and a strikingly ruby red appearance. There are also some dwarf and supergiant carbon stars, with the more common giant stars sometimes being called classical carbon stars to distinguish them.
- Asia (Wikipedia)
Asia (/ˈeɪʒə/ AY-zhə, UK also /ˈeɪʃə/ AY-shə) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometers, about 30% of Earth’s total land area and 8% of Earth’s total surface area. The continent, which has long been home to the majority of the human population, was the site of many of the first civilizations. Its 4.7 billion people constitute roughly 60% of the world’s population.