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BellaOnline Editor Renaissance Human
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On this day in 1957 – April 24th – in Britain, the first ever broadcast of the BBC's monthly documentary television programme, The Sky at Night, was aired.
The show was presented by Patrick Moore from its first airing until his death in 2012. It's been the longest-running program with the same presenter in television history, and continues to air with various astronomers presenting.
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BellaOnline Editor Renaissance Human
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On this day in 1970 – April 24th – China became the fifth nation to launch its own satellite.
The satellite Dongfanghong I had a design life of 20 days. During that time, it transmitted telemetry data and space readings to the Earth.
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BellaOnline Editor Renaissance Human
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On this day in 1990 – April 25th – the Hubble Space Telescope was deployed.
The Space Shuttle Discovery successfully launched the telescope during its STS-31 mission.
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BellaOnline Editor Renaissance Human
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On this day in 1920 – April 26th – the Shapley-Curtis debate took place on the nature and distance of "spiral nebulae".
Even in 1920, we didn't know what the "spiral nebulae" were. Were they objects in our Milky Way galaxy and therefore comparatively close? Or were they "island universes", i.e., other galaxies, and therefore at a great distance?
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BellaOnline Editor Renaissance Human
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On this day in 2017 – April 26th – the Cassini spacecraft made the first dive of the Grande Finale of its 13-year study of the Saturnian system.
It was the first of a series of close orbits that involved Cassini diving between Saturn and its rings. Astronomers collected data to learn more about the origins, mass, and age of Saturn's rings, as well as the mysteries of the gas giant's interior.
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BellaOnline Editor Renaissance Human
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On this day in 2003 – April 28th – NASA's Galaxy Evolution Explorer (GALEX) was launched.
GALEX, which operated until early 2012, was an orbiting space telescope observing galaxies in ultraviolet light. Its observations provided data about how galaxies - the basic structures of our Universe - evolve and change.
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. On this day in 1900 – April 28th – Dutch astronomer Jan Oort was born in Franeker, Netherlands.Oort made major contributions to the understanding of the Milky Way and was a pioneer in radio astronomy. He realized that the orbits of comets "implied there was a lot more solar system than the region occupied by the planets." The Oort cloud of comets that surrounds the Solar System was named for him.
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. On this day in 1906 – April 28th – Dutch-American astronomer Bart Bok was born in Hoorn, Netherlands.He's best known for his work on the structure and evolution of our Galaxy and the dark nebulae named for him. Click here to learn more about Bok globules.
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On this day in 1928 – April 28th – American geologist and planetary scientist Gene Shoemaker was born in Los Angeles, California.
Shoemaker was one of the founders of the study of planetary science. And along with his wife Carolyn and David Levy, he was co-discoverer of Comet Shoemaker-Levy 9 which hit Jupiter.
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. On this day in 1682 – May 1st – the Paris Observatory was inaugurated by Louis XIV.It's one of the oldest (and the oldest one still active) astronomical centres in the world.
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