Crashing satellites, Squeaking hearts and Glowing stars.

This week on Ask the Naked Scientists we find out our years of sending things out into space will come back to haunt us, how some hearts produce a squeaking sound, and why when you look into the night sky you could see bright coloured stars shining down on you.We'll also be finding out just how many starts there are in our universe, why some of us get heart murmurs, how far our universe goes and whether the way we eat today is reducing our immunity.
All that and more of your questions answered on this weeks Ask the Naked Scientists.