electricity
A Formula For SETI
1960 AD GREEN BANK, WEST VIRGINIA Frank Drake, the man who conducted the first modern search for radio signals from other civilizations, developed a way of thinking about how many civilizations there could be in our galaxy. It’s now known as the Drake Equation: N = R x Fs x Fp x Ne x Fl [...]
"We've Had a Problem Here"
April 11, 1970 AD LUNAR ORBIT "Houston, we’ve had a problem here," astronaut John Swigert radioed Mission Control. Indeed Apollo 13 did have a problem. Two days after the April 11, 1970 liftoff the mission was 300,000 kilometers (about 200,000 miles) from home and hurtling towards the Moon. Suddenly there was a bang.