Responding to the public’s fascination with-and sometimes undue alarm over-possible threats from asteroids, a scale developed by astronomers rates the likelihood that a particular asteroid or comet may collide with earth.
a. a scale developed by astronomers rates the likelihood that a particular asteroid or comet may
b. a scale that astronomers have developed rates how likely it is for a particular asteroid or comet to
c. astronomers have developed a scale to rate how likely a particular asteroid or comet will be to
d. astronomers have developed a scale for rating the likelihood that a particular asteroid or comet will
e. astronomers have developed a scale that rates the likelihood of a particular asteroid or comet that may