There are two types of star that can be red. Red dwarfs are smaller than the sun. Red giants are far larger than the sun.
Orange. In fact, these are often still called "red" stars for convenience.
An orange star is one whose surface temperature is higher than that of a red star but lower than that of a yellow star.
Yes.
No. The sun is a yellow main sequence star, sometimes called a yellow dwarf. The term is a bit counterintuitive, as a yellow dwarf is a bit larger than the average star, but still far smaller than a red giant.
A Red Giant would be one larger than our sun.
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A stars color is determined mainly by it's surface temperature. They tend to range from Blue (hottest) thru white and yellow to red (coolest). One thing to bear in mind tho is that a Red Giant star, for example, produces more heat than a smaller yellow star but because the star is much bigger the heat is more spread out (because the surface area is so much bigger) and therefore it appears red.
It's not. White is the hottest. Then blue, yellow orange, red.
China has a red flag with a yellow star
Many stars are bigger, but Betelgeuse is one of them, a red giant.
The surface temperature of a yellow star typically ranges from 5,000 to 6,000 degrees Celsius. This temperature range is lower than that of hotter stars like blue or white ones, but higher than cooler stars like red dwarfs.
No, Betelgeuse is a red star.