Passage 1 (Questions 21-24): Astronomers have discovered a planet three times the mass of Jupiter that travels on a long, egg-shaped path around its star. If this planet __(21)__ somehow placed into our own solar system, it would swing from within our asteroid belt to out beyond Neptune. The planet was discovered using the radial velocity method, also known as Doppler spectroscopy. The radial velocity method is the most effective method for locating extrasolar planets __(22)__ existing technology. It relies on the fact that a star does not remain completely __(23)__ when it is orbited by a planet. It moves in a small circle or ellipse, responding to the gravitational tug of its smaller companion. When __(24)__ from a distance, these slight movements affect the star's normal light spectrum, or color signature. Question 21: Choose the best answer for blank (21).