More tests to be done include the spectral analysis of CSL-1 to determine whether they're really identical images, as well as the attempts to find more examples in the skies. Joe Polchinski explains why the emission of gravitational waves is an interesting signal - a signal that can be seen by LIGO and/or VIRGO and/or LISA, as Damour and Vilenkin pointed out. Only the last paragraph of that article in New Scientist is dedicated to the fact that we still have no idea whether these cosmic strings are generic field-theoretical cosmic strings, or fundamental strings (or D-strings) from string theory.