Original: Stars range in size from neutron stars, which vary anywhere from 20 to 40 km in diameter, to supergiants like Betelgeuse in the Orion constellation, which has a diameter approximately 650 times larger than the Sun—about 0.9 billion kilometres.
Simplified: They have a diameter about 1,500 times bigger than the Sun. The star Betelgeuse, in the Orion constellation is a red supergiant star.