The Super Earths
01- K-11
02- Migrating Worlds
03- Gliese 581
04- Goldilocks
05- 51 Pegasi
06- Doppler Effect
07- Rhythmic Shift
08- Eccentric Giants
09- Transitters
10- Mu Arae
11- Intermediate World
12- Worlds Observed
13- Extra Solar Earths
14- Migrant Worlds
15- Accretion
16- Core Accretion
17- Disk Erosion
18- Planetary Embryos
19- The Protected Zone
20- Ecosphere
21- Ecosphere II
22- Beta Pictoris
23- Vanquishing Starlight
24- Red Edge / Earth Shine
25- Distant Continents
26- The Age of Stars
   

07- Rhythmic Shift

 

 

A rhythmic shift in a star’s colour, from blue to red and back, can mean that the star is heading toward us, then away from us. An unseen object large enough to affect the star 51 Pegasi must have been orbiting it, tugging it back and forth.

The extent of the shift is a rough indication of the object’s mass, and the timing tells how long the orbit takes.

 
  Alan Lambert 2011