Credit & Copyright: Ethan Kruse  
(University of Washington)  
  
  
Explanation:
The exoplanet hunting Kepler  
mission's total for candidate and   
confirmed multiple  
planet systems stands at 1,705 worlds in orbit around 685 distant stars.   
  
Put  
all of those exoplanet orbits on the same scale  
and follow  
their relative orbital motions to get  
Kepler Orrery IV.  
  
To make the planets visible, their sizes  
aren't shown to scale.  
  
But orbits of the planets in  
the Solar  
System (dashed lines)  
are included to scale in the hypnotic video.  
  
Of course, Kepler uses planetary transits to detect  
exoplanets,  
looking for a slight dimming of light  
as the planet crosses in front of its star.  
  
In the time compressed video,  
Kepler's multiplanet system orbits are all oriented  
to put observed transits at the three o'clock position.  
  
The dervish-like movements highlight a stark contrast  
between most Kepler-discovered exoplanetary systems and our own.  
  
Planning  
an interstellar vacation?  
  
Be sure to check the scale at the upper left first.  
  
The color code indicates a planet's estimated  
equilibrium surface temperature  
based on its orbit size and  
parent star.  
  
 Authors & editors: 
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official:  Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day