Astrometric Technique for Detecting Planets

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Astronomy is the study of the motion's of bodies and how the gravity of each body affects each other. Find out more about the astrometric technique for detecting planets with help from an educational professional in this free video clip.

Part of the Video Series: Outer Space
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Hi, my name is Eylene Pirez, and I'm an astrophysicist, and this is "astrometric techniques for detecting planets." Astronomy is the study of the motion's of bodies and how the gravity of each body affects each other. So, generally, how we used to do it back in the 1800's, we would look at a body and then make drawings of how it changed over time, and then it became more of a calculated technique, and it is now the most crucial technique for detecting planets. And, the way it works is let's say we see a star. If there's another planet that we can't see, we can still detect that planet by the way that the star is moving, over time. And, what happens is that even though that the star is not, obviously not orbiting the planet, it's still jiggling. So, like, it kind of orbits itself by a little bit. So, it's of it's center of orbit will be like on one of it's side, so it will rotate sort of like this, and what we will see over time is sort of like a moving, back and forth, of the planet. So, we know there has to be another gravitational affect making that star move. And, generally, this is the way that we know that we need to look for a planet there, and that's the main technique for detecting planets when we have the pretty far star. My name is Eylene Pirez, and I'm an astrophysicist, and this is "astrometric techniques for detecting planets."

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