Astronomers observe an exoplanet orbiting a star in a distant solar system. Over time, they notice that the star wobbles slightly in its position. What is the most likely cause of this motion?
Answer
A
The exoplanet moves too fast for the star's gravity to keep it in orbit, pulling the star in different directions.
B
The exoplanet's gravitational pull influences the star, causing it to move slightly in response.
C
The exoplanet repels the star's gravity, forcing the star to shift back and forth.
D
The star's gravity weakens periodically, allowing the exoplanet to change its position.
Explanation
The star and exoplanet both orbit their shared center of mass. The exoplanet’s gravity pulls on the star, making it wobble slightly as the planet moves around it. This is why astronomers can sometimes detect planets by observing a star’s motion.
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