RT @esaoperations: You may have heard about the Lagrange Points. We put Herschel and Planck at L2. Here is how they work: http://t.co/Stqjd…
RT @esaoperations: You may have heard about the Lagrange Points. We put Herschel and Planck at L2. Here is how they work: http://t.co/Stqjd…