50 Years of Human Space Exploration. This is by far the coolest pin I will see tonight. So amazing as to how far the space exploration campaign(s) has come since we first step foot into the putter abyss!
Star Cluster Pismis NGC Pismis 24 hangs over NGC a nebula about 8000 ly away in Scorpius. This picture showed that the brightest star in the cluster is in fact two stars in a tight binary orbit. Each star is about 100 times the Sun's mass.
Tony DiTerlizzi illustration [a creature with a tall stack of books balanced on its head with smaller creature at the top reading with a sign above it that says "more books please"] Spiderwick Chronicles!
25 Standalone Books To Read After Series Burnout (teens and adult books) I can vouch for American Gods and Eleanor and Park. I loved Marcus Zusak's The Book Thief. (I can vouch for none, but I'm keeping this pinner's tag for future reference).
sunset on Mars : From the NASA website: On May NASA's Mars Exploration Rover Spirit captured this stunning view as the Sun sank below the rim of Gusev crater on Mars. This Panoramic Camera mosaic was taken around in the evening of the rover's Martian day.