1,645 followers
"@AstroPHYPapers: A Curious History of Sunspot Penumbrae. http://t.co/fNr1YvRalL" #astrophysics
"@AstroPHYPapers: A Curious History of Sunspot Penumbrae. http://t.co/fNr1YvRalL" #astrophysics
A Curious History of Sunspot Penumbrae http://t.co/sglofWPsrC
A Curious History of Sunspot Penumbrae http://t.co/sglofWPsrC