• What makes stars glow?
  Stars glow because the enormous pressure deep inside generates ...

• How hot is a star?
  The surface temperature of the coolest stars is below 6,300°F ...

• What makes stars twinkle?
  Stars twinkle because the Earth's atmosphere is never still, and ...

• What colour are stars?
  It depends how hot they are. The colour of medium-sized stars varies ...

• What is a pulsar?
  Pulsars are stars that flash out intense radio pulses every ten ...

• How old are the stars?
  Stars are dying and being born all the time. Big bright stars live ...

• What is a red giant?
  Red giants are the huge, cool stars formed as surface gas on ...

• What are the oldest stars?
  The oldest stars we know of are not stars at all, but simply look ...

• What is a white dwarf?
  White dwarfs are the small white stars formed as stars smaller than ...

• What are neutron stars?
  Neutron stars are all that remains of a supergiant star after a ...