In Searches for Planets Orbiting Stars Other Than the Sun,what

question 6

Multiple Choice

In searches for planets orbiting stars other than the Sun,what is the astrometric method?

• A) searching for tiny "bumps" on images of a star, due to the light from a planet located close to the star
• B) searching for tiny displacements of the infrared image of a star compared with its optical image, caused by the presence of planets that are cool and thus emitting primarily in the infrared
• C) searching for tiny wobbles in the position of a star, due to the gravitational pull of a planet orbiting around it
• D) searching for tiny wobbles in the positions of absorption lines in a star's spectrum, caused by radial-velocity variations of the star as the result of a planet orbiting around it