In a recent article in Nature magazine, 1 August 1996, vol. 382 p. 426, a team of astronomers in Japan announced the detection of carbon monoxide in a galaxy called 'BR1202-0725' which was known to be a strong infrared emitter. Its redshift is z = 4.69 which means that we are seeing this galaxy as it was when the universe was less than 1 billion years old. With an estimated dust mass of 1 billion times the Sun, and temperature of about 100 K, it is undergoing a tremendous star forming episode. The detection of a molecule like carbon monoxide in this distant galaxy means that elements as complex as carbon and oxygen had already formed, and been mixed into the interstellar medium of these proto-galaxies when the universe was only a few hundred million years old. This places severe constraints on how quickly after the Big Bang, massive stars could have formed and gone supernova in enough time to manufacture these heavy elements. The 'first generation' stars must have been very massive to evolve so quickly to supernova, and this is consistent with some theoretical predictions that these stars should have had masses above 50 solar masses and lived only a few million years.