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!
The universe consists of visible matter (the stuff we see) dark matter (matter that fills the space in our universe that we can't see at all) dark energy (which is stronger than gravity and causes the universe to expand)
The Solar System consists of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately billion years ago. of the system’s mass is in the Sun.
The Eridanus Void. This area shows almost no signs of cosmic matter, meaning no stars, planets, solar systems or clouds of cosmic dust. Researchers couldn't even find dark matter, which is invisible but measurable by matter once present in the region.
“An Early History of Satellites.” (Credit: Broadband Wherever) It’s not often that one associates a satellite with French folk songs, but this infographic does that and more. On it you will find the major launches of the early space age — from the Soviet
Principia Geometric  eBook - the quantum geometrics of Mathematics out now - revealing the foundational geometry of equilateral Planck energy momenta underlying and unifying the math of physics..... [part of the Tetryonic unified physics theory series] https://drive.google.com/file/d/0B0xb7kQORMdDeUNmU3BuNVRqeHc/edit?usp=sharing