The central band of stars on the Hertzsprung-Russell Diagram. These stars' energy comes from nuclear fusion, as they convert Hydrogen to Helium. Most stars are Main Sequence Stars. For these stars, the hotter they are the brighter. The sun is a typical Main Sequence star.
A star whose brightness and temperature place it on the Main Sequence, in the Hertzsprung-Russell Diagram. As it happens, a star whose energy source is the fusion of hydrogen to helium, either through the proton-proton cycle (for lower Main Sequence stars), or the carbon cycle (for upper Main Sequence stars).
a star that is in its normal state, such as the sun
a young star in which energy is primarily produced from fusion of hydrogen into helium in its core
A star that derives its energy from the conversion of hydrogen into helium in its core. The Sun is a main sequence star. (See also Hertzsprung-Russell diagram.)
A star in the prime of its life; where hydrogen inside is undergoing nuclear fusion
A normal star like the Sun that is burning hydrogen in nuclear reactions to produce its energy. Other types of stars include: giant stars, supergiant stars and white dwarfs.
A star burning hydrogen in its core.