Cosmic Rulers
Planetary Planarity
Radial Velocity Technique
Target: Gamma Cephei
Other Targets
Tools of the Trade

Extrasolar Planets, Radial Velocity, and Astrometry

Setting the Scene

Text and graphics by Fritz Benedict

The Device, a seesaw or teeter-totter

illustration of a seesaw

The Players

illustration of one adult and one child

The adult and the child sit on the teeter-totter. What happens? At first, not much. The child rises into the air and stays there.

A Static Situation

illustration of the adult outweighing the child on the seesaw

Both the child and the adult know which way the adult has to scoot (carefully! Teeter-totters can have splinters!) to turn this into a dynamic (moving) event.