Using only newtonian gravity and approximate values to get an approximate answer. consider two collapsed stars, each with a mass of 10a32 kg. they are orbiting the midpoint between them with a frequency of 100 hz, and so are radiating gravitational waves at twice this frequency*. estimate the distance between them. (newton's constant of universal gravitation is 6.67*10^11 n. m^2.kg^-2. * they only briefly have this frequency, because the energy of their gravitational radiation comes from their orbital energy, so they are spiralling rapidly inwards supplementary question: dr blair jnr, (an excited australian physicist working on the project) was interviewed on radio national this morning and chose to demonstrate them using a cello. why a cello rather than a violin? both can play what physicists call a chirp and what musicians call portamento. can you think why it might be difficult to find frequencies much higher than 100 hz?