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  1. [Source.] (https://www.youtube.com/watch?v=kL4lZID-ja0)

    The gravity of a planet, however weak it might be, is enough to pull its parent star just a little bit out of place as the planet orbits.

    While the radial velocity method studies a star’s spectrum to measure the star’s “wobble” toward and away from Earth, there is another trick to measure this tell-tale motion: simply look for the star to move back and forth in the sky.

    With exceptionally sharp vision, a telescope can actually see a star move relative to other stars. Astrometry is the science of precisely measuring the position of objects in the sky. If astronomers use this method to monitor a star and see that it sways with a periodic rhythm, like slow dancers at a prom, they can tell that an unseen companion β€” perhaps a planet β€” is orbiting the star and pulling it to and fro.

  2. The source of this gif is:
    **[Planet Hunting Techniques: Astrometry](https://www.youtube.com/watch?v=kL4lZID-ja0)**

    > Uploaded by [**hubblesitechannel**](https://www.youtube.com/user/hubblesitechannel)
    View count: **2,119**
    Video length: **0:13**
    Likes/dislikes: πŸ‘ **39** / πŸ‘Ž **0** / πŸ’¬ **5**
    Uploaded on: **2014-05-07**

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