Day: September 5, 2026

On This Day, September 5: Voyager 1 Launches

Posted on by Dan

On September 5th, 1977, a spacecraft weighing less than a ton lifted off from Cape Canaveral, Florida and began a journey with no return. The first of two missions, Voyager 1 would encounter worlds no human had ever seen up close, and travel farther than any human-made object in history – eventually leaving the Solar System and heading into interstellar space.

Voyager 1 launched on September 5, 1977, from Cape Canaveral, Florida
Voyager 1 launched on September 5, 1977, from Cape Canaveral, Florida

Launched in 1977, the Voyager program was an ambitious mission designed to explore the boundaries of the Solar System and beyond. Voyager 1 first major destination was Jupiter, where it reached in 1979. It provided detailed observations of Jupiter’s atmosphere, magnetic field, rings, and moons. The following year it reached Saturn where it observed its rings and numerous moons and made a particularly close encounter with Titan. The spacecraft continued its journey away from Earth and in 2012 it crossed the heliopause and entered interstellar space, becoming the first human-made object to accomplish that incredible feat. Voyager 1 also carries on of humanity’s most remarkable messages: the Golden Record. This record contains images, music, natural sounds, and greetings representing various human cultures and was included on the spacecraft for the unlikely possibility that an alien civilization might someday find it.

The launch of Voyager 1 represents one of the greatest triumphs of science. Centuries of discoveries in a multitude of scientific disciplines gave humanity the capability of constructing a machine capable of traveling billions of miles to the edge of the Solar System and beyond. It’s a testament to what we can accomplish when curiosity is combined with the scientific enterprise. 

Another day, another discovery. Browse the On This Day Archive.

On This Day, September 4: Pearl Street Station Opens

Posted on by Dan

For most of human history and civilization we have lived without electricity – a point which I repeatedly remind my wife and which she surely is sick of hearing by now. Nevertheless, all of the benefits of electricity have arrived to humanity within the last 150 years. By the late 19th century, scientists and inventors had learned how to generate electricity and produce practical lighting. The trick was how to deliver it to an entire city. On September 4, 1882, Thomas Edison’s Pearl Street Station began supplying electricity to customers in lower Manhattan, becoming the first permanent, commercial electric generating station in the United States.

Pearl Street Station
Pearl Street Station

The power plant generated electricity by burning coal and initially powered around 400 lamps to 82 customers. Although impressive for the time, the area it covered was small by today’s standards totaling roughly one quarter of a square mile. Six massive generators nicknamed Jumbo Dynamos produced direct current electricity that traveled through underground copper wires to the nearby buildings. The achievement was remarkable because Edison and his team did not succeed in producing just another device – it produced a system. The generators produced electricity, the underground cables distributed it, the meters measured the consumption, and the incandescent lamps converted the electricity into light. 

The Pearl Street Station represents an important lesson in the history of science and technology: discovering the lasts of nature is only the beginning. The next important challenge is transforming that knowledge into something capable of improving everyday life. Within a few generations, electricity would revolutionize nearly every aspect of human life. 

Another day, another discovery. Browse the On This Day Archive.