Brian G. Marsden claims that neither deserves true credit: "Neither Edgeworth nor Kuiper wrote about anything remotely like what we are now seeing, but Fred Whipple did".
Brian Marsden tvrdi da nijedan od navedenih ne zaslužuje pune zasluge: "Ni Edgeworth ni Kuiper nisu pisali ni o čemu sličnome što vidimo danas, ali Fred Whipple jest."