Question

complete the text with the best transitions. many astronomers argue that exoplanet research holds the key to understanding the potential for life beyond earth, but the search is fraught with challenges. __________ detection often relies on indirect methods like transit observations, where a planet passing in front of a star causes dimming, or radial velocity measurements, which track a stars wobble due to a planets gravitational pull. additionally, the vast distances between earth and these celestial bodies make direct observation nearly impossible with current technology. __________, recent discoveries of earth - like exoplanets in habitable zones offer hope for finding extraterrestrial life. to illustrate... nonetheless accordingly... in essence for instance... indeed for one... to be clear

Explanation:

The first blank needs a phrase to introduce examples of the challenges (transit observations, radial - velocity measurements), so "For instance" is appropriate. The second blank needs a word to show contrast between the challenges and the hope brought by recent discoveries, so "Nonetheless" is suitable.

Answer:

For instance ... Nonetheless