September 27

1905 – The physics journal "Annalen der Physik" published Albert Einstein's paper "Does the Inertia of a Body Depend Upon Its Energy Content?", introducing the equation E=mc².
1954 – Star Trek art supervisor / legend Denise Okuda is born.
2003 – The first European mission to the moon is launched, sending the Smart 1 probe and satellites up via a solar-powered engine.
2007 – NASA launches the Dawn probe to study the asteroid belt.
2008 – CNSA astronaut Zhai Zhigang becomes the first Chinese person to perform a spacewalk while flying on Shenzhou 7.