E = mc2 - the equation that made his name
Died: 18 April 1955
Most certainly it’s the General Theory of Relativity that made Albert Einstein known all-over the world, but the genius worked on dozens of scientific problems such as gravitational waves until he died on this day in 1955.
© Oxford Science Archive/Getty Images
Radiofax: sending photos long before the email was born
18 April 1925
You’ll be surprised to know that the first commercial radiofax transmission of a photograph wasn’t a cat gif but instead actress Marion Davies receiving a make-up box as present from Metro-Goldwyn-Mayer boss Louis Mayer.
Marion Davies, 1930 (© George Hurrell via John Kobal Foundation/Getty Images)
The man who crossed out God from the Origin of Species
Died: 19th April 1882
Not only did the development of the evolutionary theory secure Charles Darwin a place in history, but also the honour of a place on the ten-pound note. He died on this day aged 73 in 1882.
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The first home in space
19 April 1971
With the launch on this day of Salyut 1 – the very first space station - the Soviet Union stole a march on their rivals in the space race against the USA.
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The Curies isolate radium
20 April 1902
After their discovery of the radioactive element radium in 1898, Marie and Pierre Curie isolate the first sample of it in 1902. One year later they will win the Nobel Prize in Physics for this finding.
Pierre Curie and Marie Curie, 1898 © Culture Club/Getty Images
Welcome to the Moon!
21 April, 1972
The Apollo 16 mission with John Young, Charles Duke and Ken Mattingly on board was the fifth to land on the Moon.
© Encyclopaedia Britannica/UIG Via Getty Images
Immanuel Kant - a philosopher and astronomer is born
Born: 22 April 1724
Immanuel Kant is well known for his contribution to philosophy but he was also an astronomer. He is the developer of the Nebular hypothesis, the idea that the Solar System evolved from a nebula, a massive cloud of gas.
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There’s no backup Earth
22 April 1970
The first Earth Day is held on this day in the USA, but since 1990 the event has gone global raising awareness for the environment’s protection worldwide. We do share the same planet after all.
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The father of the quantum theory
Born: 23 April 1858
When Max Planck developed quantum physics to solve a thermodynamic problem, he regarded it as “purely formal assumption”. In fact he revolutionised physics and received the Nobel Prize for the discovery.
© Bettmann/Getty Images
23 April 1981
For the first time, surgeons in the USA transplant artificial skin made from collagen. It mainly helps patients with serious burns.
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Ride on a wave of light
23 April 1827
William Rowan Hamilton presents a function that combines mechanics, optics and mathematics. It becomes the foundation for the theory that light is energy in form of waves.
© Hulton Archive/Getty Images
Our eye in the sky
Launched: 24 April 1990
Since its launch in 1990 the Hubble Space Telescope regularly leaves us staring speechlessly at the Universe’s beauty with every picture it sends down to Earth.
© Stocktrek Images/Getty Images
BBC brings The Sky at Night into living rooms
24 April 1957
Patrick Moore presents the first episode of the BBC’s TV documentary programme The Sky at Night. He will continue until his death in 2012, setting up a TV record longest-serving presenter of a TV show. Here he is eating some space snacks.
Patrick Moore, circa 1965 (© Keystone/Hulton Archive/Getty Images)