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swarm
Astronomy
planet
universe scale
habitable exoplanet Gliese 581d
planets adrift
Astronomy science space scale universe
weird radiation science spews galactic core
gamma ray burst astrology science
story ideas
sun solar flares
Space images by Astronomy Photographer of the Year Martin Pugh
astronomy The Hubble Ultra Deep Field in 3D Science
astronomy black holes
astronomy astrophysics gamma rays
science astronomy
mercury astronomy
Mark Harding
http://about.me/m.a.harding