The wobble in a star’s motion resulting from an orbiting planet (extrasolar) can be detected by observing a. a Doppler shift in the star’s spectrum. b. the motion directly with a telescope. c. the interaction of the star’s motion with a dense gas disk around the star. d. radio energy emitted by the very low density dust disk around the star. e. the wobble is too small and therefore cannot be detected by Earth-based instruments.

The wobble in a star’s motion resulting from an orbiting planet (extrasolar) can be detected by observing a. a Doppler shift in the star’s spectrum. b. the motion directly with a telescope. c. the interaction of the star’s motion with a dense gas disk around the star. d. radio energy emitted by the very low density dust disk around the star. e. the wobble is too small and therefore cannot be detected by Earth-based instruments.

	a.	a Doppler shift in the star’s spectrum.
	b.	the motion directly with a telescope.
	c.	the interaction of the star’s motion with a dense gas disk around the star.
	d.	radio energy emitted by the very low density dust disk around the star.
	e.	the wobble is too small and therefore cannot be detected by Earth-based instruments.