Question

the exoplanet pi mensae d was discovered using an indirect approach to planetary detection, the radial velocity method. compared to that of the direct imaging method, ______ the effect these exoplanets have on nearby stars. which choice completes the text so that it conforms to the conventions of standard english? a. the detection of distant exoplanets, too dim to be observed in the radial velocity method’s vast zone of discovery, is based on b. the radial velocity method’s zone of discovery is vast, as distant exoplanets too dim to be observed are detected by c. the radial velocity method, with its vast zone of discovery, detects exoplanets that are too dim to be observed by d. distant exoplanets too dim to be observed are detected within the radial velocity method’s vast zone of discovery through

Explanation:

The sentence contrasts the radial velocity method (indirect) with the direct imaging method. The direct imaging method’s limitation is that exoplanets are too dim to be observed directly, so the radial velocity method is used instead. Option C correctly completes the contrast by stating the radial velocity method’s advantage (vast discovery zone) and the direct imaging method’s limitation (exoplanets too dim to observe).

Answer:

C. the radial velocity method, with its vast zone of discovery, detects exoplanets that are too dim to be observed by