This Day In History : April 27

1961 United States

NASA Launches Explorer 11 to Study Gamma Rays

On April 27, 1961, NASA launched Explorer 11 into Earth orbit. This satellite was designed to study gamma rays in space. It marked an early effort in space-based gamma-ray astronomy, providing valuable data on cosmic gamma-ray sources.

Also on This Day in History April 27

Discover what happened on April 27 with HISTORY's summaries of major events, anniversaries,
famous births and notable deaths.

Births on This Day, April 27
  • 1896 Wallace Hume Carothers

    American chemist who developed nylon (1935), the first synthetic polymer fibre to be spun from a melt.

  • 1846 Charles Joseph Van Depoele

    Belgian-American inventor who was a pioneer in railway, electric lighting, and mining work, with more than 100 patents on electrical inventions.

  • 1875 Maurice de Broglie

    (6th duke) (Louis-César-Victor-) Maurice de Broglie was a French physicist who made many contributions to the study of X rays.

  • 1913 Philip Abelson

    American physical chemist who proposed the gas diffusion process for separating uranium-235 from uranium-238 which was essential to the development of the atomic bomb.

  • 1942 Valeri Vladimirovich Polyakov

    Russian cosmonaut and doctor who established the record for the longest continuous stay in space of 438 days (8 Jan 1994 - 22 Mar 1995) aboard Russia's Mir Space Station.

Deaths on This Day, April 27
  • 1936 Karl Pearson

    English mathematician who was one of the founders of modern statistics.

  • 2004 Roy Walford

    American pathologist and gerontologist who pioneered, and wrote books on, the idea of restricting food intake to extend life span.

  • 1999 Mark David Weiser

    American computer scientist and visionary who was the chief technology officer at XEROX PARC, and is remembered for developed the pioneering idea for what he referred to as “ubiquitous computing.”

  • 1932 Max Rubner

    German physiologist who showed the available energy content of food was the same whether the material was consumed organically or merely burned (1894).

  • 2002 Ruth Handler

    American inventor who created the Barbie Doll (1959), a teenage doll with a tiny waist and slender hips, and Ken, a boy doll (1961), which she named after her children.

1898

1898 - First Weather Bureau Kite Launched

The United States Weather Bureau launches its first kite from Topeka, Kansas. This innovative method is used to gather atmospheric data, enhancing weather forecasting capabilities. The kite carries instruments to measure temperature, humidity, and atmospheric pressure.
1981

1981 Xerox PARC Introduces the Computer Mouse

In 1981, Xerox PARC introduced the computer mouse, revolutionizing human-computer interaction. This device allowed users to interact with graphical interfaces more intuitively. The mouse's introduction paved the way for modern computing and user-friendly interfaces.
2022

2022 - SpaceX Launches Crew Dragon with First Black Woman for Extended ISS Mission

On April 27, 2022, SpaceX launched its Crew Dragon capsule with four astronauts, including Jessica Watkins. Watkins became the first black woman to serve an extended mission on the International Space Station (ISS). This mission highlights the growing diversity in space exploration.
1935

Brussels World Exposition Opens

The Brussels World Exposition, also known as the Brussels International Exposition, opened its doors on April 27, 1935. This grand event showcased innovations and cultural exhibits from around the globe. Held in the Heysel Plateau, it attracted millions of visitors and highlighted Belgium's role in international affairs.
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