that stars make their own light. Their self-luminous makes
stars different from planets, moons, asteroids, and comets,
all of which shine by reflecting sunlight.
Stars are also
different in other ways as well. They have more mass, have
different compositions, are hotter, and most are bigger than
planetary objects.
If we take the Sun for example, which is
our nearest star. It is a self-luminous, gaseous sphere. It has
no solid surface. It is about 100 times bigger than Earth and
its mass is about 300,000 times heavier than Earth. Its central
temperature is 15 million degrees Kelvin (27 million degrees
Fahrenheit),Sun's visible surface is a relatively cool 6,000
degrees Kelvin (10,000 degrees Fahrenheit).
The Sun is made of hydrogen and some helium.
