A famous crossed lunar selfie: Alan Bean's picture of Pete Conrad taking Alan's picture during #Apollo12's extravehicular activity, 52 years ago #Todaygo.nasa.gov/2g6SmjS
At Pete's left wrist, his checklist open to one of the pages on which the backup crew pasted pics of Playboy Playmates bit.ly/2fgFrhS#Apollo12, #52YearsAgoToday
The only time humans visited a probe landed before them on another world: the Apollo 12 crew visited the landing site of Surveyor 3, 52 years ago #Today during their second extra-vehicular activity go.nasa.gov/2g6SmjS
52 years ago #Today, Alan Bean and Pete Conrad walked on the Moon for the second time in human history. After the extraveicular activities, they returned back to the command module: this is a sped up video of the docking buff.ly/344KMzL#Apollo12
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Born 400 years ago #Today, Blaise Pascal was child prodigy, mathematician, physicist, inventor, writer and Catholic theologian. He was pioneer in the natural and applied sciences and invented one of the first mechanical calculators
Pascal designed and built one of the earliest mechanical calculators, known as Pascal's Calculator or Pascaline. It was a pioneering device that used gears and wheels to perform addition and subtraction. It laid the foundation for mechanical computation
He introduced the namesake Triangle, a triangular arrangement of numbers with various mathematical properties. Each number in the triangle is the sum of the two numbers directly above it.
54 years ago #Today, one of the most famous images ever taken was snapped from the orbit of the Moon. Now known as "Earthrise", with modern digital technology, the iconic image -- originally in black and white -- has been remastered ow.ly/Hir130n5JpX
“The vast loneliness up here of the Moon is awe inspiring, and it makes you realize just what you have back there on Earth. The Earth from here is a grand oasis to the big vastness of space.” — Apollo 8 astronaut Jim Lovell buff.ly/2EMnMMG#Apollo8#54YearsAgoToday
54 years ago #Today, Apollo 8 entered the lunar orbit. Humans are in orbit around another world for the first time. This is the third TV live broadcast. A #Christmas gift: human eyes see the Moon up close bit.ly/2ionb8I
The Large Hadron Collider is the world’s largest, most powerful particle accelerator: in a way it's the world's largest single machine. It consists of a 27-km ring excavated between the lake of Geneva and the Jura mountain range at an average depth of 100 m. Let's see some facts
Each of the 6000-9000 superconducting filaments of niobium-titanium coiled between them to make up the LHC cables is 0.007 mm thick, about 10 times thinner than a normal human hair. If put one after another they would stretch from the Earth to the Sun and back six times
The protons accelerated are obtained from standard hydrogen. Although proton beams are very intense (1.15x10¹¹ protons in a beam size of 3.5 micrometres), only 2 nanograms of hydrogen are accelerated each day. It would take about 1 million years to accelerate 1 gram of hydrogen.