Stars range in size from neutron stars , which vary anywhere from NUMBER@1 to NUMBER@2 km in diameter , to supergiants like LOCATION@1 in the ORGANIZATION@1 constellation , which has a diameter approximately NUMBER@3 times larger than the Sun -- about NUMBER@4 billion kilometres .

They have a diameter about NUMBER@5 times bigger than the Sun . The star LOCATION@1 , in the ORGANIZATION@1 constellation is a red supergiant star .
